Abstract: There is provided a network control device capable of surely distributing a content even when a relay function of one of the nodes contained in a network stops, without affecting the process in nodes below the node and while improving the re-liability of the network system itself. When controlling a node contained in a network system including a server and a plurality of nodes constituting a plurality of hierarchies and connected to one another, wherein a content is distributed from the server to the respective nodes, it is checked whether a content relay function in a node located at the uplink with respect to the node in the content distribution has stopped. When the stop of the relay function is detected, control is performed so that the consumption speed of the content accumulated in the lower node in the process executed in the node is smaller than the consumption speed before the relay function has stopped.

Abstract: A first node device transmits to a second node device unique identification information corresponding to specific common information, receives from the information saving node device the relevant information regarding the information saving node device, and requests to a selected information saving node device delivery of the specific common information, the second node device searches the node information and, in a case where there is node information, transfers the identification information to the information saving node device, which is indicated by node information, and the information saving node device, in a case where the transmission of the specific common information indicated by the identification information is available, transmits to the first node device the relevant information regarding the information saving node device, and, in a case where delivery request for the specific common information is received from the first node device, delivers specific common information.

Abstract: The present invention provides a distribution system in which even in the case where the content distributability varies among content holders, desired content can be promptly and efficiently received by a requester. To index information recorded in a root node or cache node so that it can be referred to from the requester, in addition to content ID and IP address of a content holder, easiness information indicative of easiness of distribution of content from the content holder are added. When the requester determines a content holder as a distribution source, a content holder having high distributability is preferentially selected with reference to the easiness information and content is distributed from the selected content holder.

Abstract: A tree type network system including an information delivery device, a plurality of node devices, and an administration, wherein the node devices are connected in a tree-like shape via a communication route while placing the information delivery device in an uppermost level and forming a plurality of hierarchy levels, and the delivery information is sequentially transferred from the node device in an upper hierarchy level to the node devices in lower hierarchy levels, wherein the administration device includes: a device for acquiring attribute information of a node device, which transmits participation request information, and determines device information on the basis of the attribute information thus acquired upon receipt of participation request information of requesting device information of node device as connection candidate, and a device for transmitting the connection end candidate information thus determined to the node device which transmits the participation request information.

Abstract: There is provided an information communication system or the like that reduces load to a node device or the like for transmitting information when information is transmitted to a plurality of node devices. In an information communication system formed by participation of a plurality of node devices, mutually connected through a communication route, a node device X determines representing node devices included in each of groups divided into a plurality of (four) groups in accordance with a predetermined rule (for example, DHT), transmits main information to node devices A, B, and C thus determined, and in a case where destination of main information received from another node device is the group the node device X belongs to, transmits the main information thus received to a node device representing a group, to which the node device X belongs.

Abstract: The present invention is to provide a node device, a shared information update processing program, a shared information update means, and an information sharing system, which can quickly and assuredly update the shared information in each of the node devices without applying an excessive load to a specific apparatus such as a server. According to the present invention, there is provided a plurality of node devices mutually connectable through a network, each of the node devices saving shared information, used in common with the nodes, and in a case where each of the node devices transmits predetermined data to the node device, being a connection counterpart, the node device describing version information indicative of a version of the shared information, saved by the own node device, including: a data receiving means; a version judgment means; and a shared information update means.

Abstract: A node device which participates in an overlay network formed by participation of all or part of a plurality of node devices which are connected to each other via a communication device. The node device includes a search information transmission device, a reply information receiving device, a communication load information device, a communication load comparison device, a node selection device and a participation request information transmission device. The search information transmission device transmits search information to search a node device transmitted to an information processing device connected to the communication device. The receiving device receives information replied from the plurality of node devices. The comparison device compares information regarding communication load in each of the communication routes. The selection device selects a node device on the basis of comparison result by the comparison device.

Abstract: An information delivery system or the like which autonomously distribute and arrange contents as many as a number necessary inside the delivery system at appropriate positions inside the delivery system without providing a server or the like which administrates ubiety and number of the contents. There is provided an information delivery system having a plurality of information processing apparatuses which can mutually communicate through a network and a registration apparatus which holds at least one or more common information pieces so as to be used in common with the plurality of information processing apparatuses.

Abstract: In a first node in a system having nodes connected to each other as a network, request information including identification information and request number of location information indicating a location in the network of information saving nodes is transmitted to a second node. In the second node, the location information and identification information are saved. At least the location information whose number corresponds to the request number is transmitted to the first node when the number of the saved location information meets the request number. Otherwise, the location information whose number corresponds to the number of the saved location information is transmitted to the first node. The received request information is transferred when the second node itself is not a management node, to a node interposed between the second node and the management node, or to the management node when there is no node therebetween.

Abstract: A node device to participate in an overlay network formed by all or a part of a plurality of node devices, mutually connected through a communication network, including: a device information acquisition means for acquiring device information of node devices to which participation request information is to be transmitted; a reachable range setting means for setting up the participation request information, transmitted on the communication network; a participation request information transmission means for adding reachable range to the participation request information and transmitting it to each of the node devices specified by the device information acquired; a reply information receiving means for receiving reply information, transmitted from a node device, and including a transfer destination table for the overlay network; and a transfer destination table generation means for generating the own node device on the basis of the transfer destination table included in the reply information received.

Abstract: A connection state control device is provided that can promptly perform a reproducing operation by smoothly switching channels at each node and reduce the load on the management server in a case where operations are performed so as to sequentially change distribution information to be received at each node in a network system having a tree structure. A node receives content being distributed over a network, and performs an operation of reproducing the received content. When the node is to receive different content being distributed over a different network, the node is connected to the different network. After that, the node receives and reproduces the different content. The node continues to receive the original content but suspends the operation of reproducing the original content after connected to the different network.

Abstract: The apparatus includes effective bandwidth information obtaining means for obtaining effective bandwidth information indicative of an effective bandwidth of each of the communication paths attached to the receiving devices so that each of the receiving devices is connected to the receiving device or the distributing device at the higher hierarchical level; effective bandwidth comparing means for comparing the effective bandwidths of the communication paths; and connection mode setting means for setting a mode of connection among the devices on the basis of a result of comparison of the effective bandwidth comparing means.

Abstract: It is the object of the present invention to provide a processing apparatus, a tree-type network system, processing program and recording method that are capable of performing requests to a higher-order apparatus at the same time, while reducing the load that is concentrated in the communication path upstream in the network. One node apparatus which is provided with tree-type network system including broadcasting apparatus sending inquiry information as request-reception-begin data etc. for requesting sending response message as select-node information etc.

Abstract: A node device to participate in an overlay network formed by all or a part of a plurality of node devices, mutually connected through a communication network, including: a device information acquisition means for acquiring device information of node devices to which participation request information is to be transmitted; a reachable range setting means for setting up the participation request information, transmitted on the communication network; a participation request information transmission means for adding reachable range to the participation request information and transmitting it to each of the node devices specified by the device information acquired; a reply information receiving means for receiving reply information, transmitted from a node device, and including a transfer destination table for the overlay network; and a transfer destination table generation means for generating the own node device on the basis of the transfer destination table included in the reply information received.

Abstract: The present invention is to provide a node device, a shared information update processing program, a shared information update means, and an information sharing system, which can quickly and assuredly update the shared information in each of the node devices without applying an excessive load to a specific apparatus such as a server. According to the present invention, there is provided a plurality of node devices mutually connectable through a network, each of the node devices saving shared information, used in common with the nodes, and in a case where each of the node devices transmits predetermined data to the node device, being a connection counterpart, the node device describing version information indicative of a version of the shared information, saved by the own node device, including: a data receiving means; a version judgment means; and a shared information update means.

Abstract: An information delivery system or the like which autonomously distribute and arrange contents as many as a number necessary inside the delivery system at appropriate positions inside the delivery system without providing a server or the like which administrates ubiety and number of the contents. There is provided an information delivery system having a plurality of information processing apparatuses which can mutually communicate through a network and a registration apparatus which holds at least one or more common information pieces so as to be used in common with the plurality of information processing apparatuses.

Abstract: A tree type network system including an information delivery device, a plurality of node devices, and an administration, wherein the node devices are connected in a tree-like shape via a communication route while placing the information delivery device in an uppermost level and forming a plurality of hierarchy levels, and the delivery information is sequentially transferred from the node device in an upper hierarchy level to the node devices in lower hierarchy levels, wherein the administration device includes: a device for acquiring attribute information of a node device, which transmits participation request information, and determines device information on the basis of the attribute information thus acquired upon receipt of participation request information of requesting device information of node device as connection candidate, and a device for transmitting the connection end candidate information thus determined to the node device which transmits the participation request information.

Abstract: The present invention enables replicas of the necessary number in a distribution system to be disposed autonomously in proper positions in the distribution system without providing a server or the like and enables necessary content to be distributed more efficiently. One or plural pieces of content is/are recorded in nodes N1 to N4 as components of a distribution system in which content C1 to C4 to be distributed are directly transmitted/received among the nodes N via a network. An evaluation value having a value based on at least the number of distribution requests is generated and stored for each piece of the content C1 to C4.

Abstract: The present invention provides a distribution system in which even in the case where the content distributability varies among content holders, desired content can be promptly and efficiently received by a requester. To index information recorded in a root node or cache node so that it can be referred to from the requester, in addition to content ID and IP address of a content holder, easiness information indicative of easiness of distribution of content from the content holder are added. When the requester determines a content holder as a distribution source, a content holder having high distributability is preferentially selected with reference to the easiness information and content is distributed from the selected content holder.

Abstract: In an information delivery system including a plurality of node devices connected each other to thereby configure a network, a first node device includes a device for transmitting request information based on unique identification information corresponding to specific common information and request number information indicative of request number of node information to a second node device to thereby request transmission of the node information concerning a plurality of information saving node devices, included in the plurality of node devices and saving specific common information, which is specified out of common information to be shared among the plurality of node devices, and the second node device includes : a device for searching node information corresponding to the identification information and indicated by request number information included in the request information as many as request number upon receipt of request for the specific common information and a device for transmitting the node informati