Abstract: A reduction in network load as well as an increase in speed of response through caching and an increase in communication efficiency through buffering are both achieved. A data storage control system that temporarily stores and controls data exchanged between a user terminal 1 and an online storage device 3 includes a storage unit 24 that temporarily stores receive data read from the online storage device 3 by the user terminal 1 and transmit data to be written in the online storage device 3 by the user terminal 1, and a data transmission unit 12 and a data control unit 23 that cause new storage of the transmit data in the storage unit 24 to wait in a case where a volume of the transmit data stored in the storage unit 24 is greater than a threshold value and/or in a case where an elapsed time from a last access to the receive data that is planned to be deleted next time among the receive data stored in the storage unit 24 is shorter than a threshold value.

Abstract: The purpose of the present invention is to appropriately detect propagation delay and the like (minimum delay value) in order to appropriately control a transmission rate of information. Upon input of a measured value of delay that is smaller than a value set as a minimum delay value, a minimum value setting unit (2) updates the set minimum delay value to the measured value of the delay. Delay refers to the time from transmission of information to arrival at the destination thereof, or the round trip time from transmission of information to receipt of reply information from the destination receiving the information by the originator. A timing determination unit (3) determines a review timing for reviewing the set minimum delay value on the basis of the measured value of the delay. A minimum value review unit (4) updates (reviews) the set minimum delay value at the determined review timing.

Abstract: This system 1 accepts content marker information including content identifier information for identifying content, and executes a process of causing a storing device to store the accepted content marker information. The system 1 accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. The system 1: accepts a content marker output request that includes user identifier information for identifying a user and that is a request for an output of content marker information; based on the user identifier information included in the accepted content marker output request and the accepted sharing-user identifier information, extracts content marker information corresponding to the user identifier information from the stored content marker information; and outputs the extracted content marker information.

Abstract: This system 1 accepts content marker information including content identifier information, and executes a process of causing a storing device to store the content marker information. The system accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. Upon acceptance of a content marker output request, the system transmits content marker information extracted based on the accepted sharing-user identifier information, to user equipment 2a, 2b. Upon acceptance of the content transmission request based on the content marker information, the system determines whether to transmit content data to the user equipment based on stored viewing permission information.

Abstract: To provide a data transmission device for effectively improving throughput (transmission efficiency) regardless of whether a physical bandwidth in a network varies frequently; the data transmission device for transmitting data to a user terminal via a network and controlling subsequent transmitting operations by correlating delay of a packet pertaining to this transmission with network information includes: a variation detection circuit that detects, on the basis of the delay and the network information, that a minimum value of the delay has increased; and an alteration processing circuit that calculates, when the increase is detected by the variation detection circuit, the increased minimum delay value by using data pertaining to a specific packet, and updating a current minimum delay value with the calculated value.

Abstract: A data transmission device, method, and program therefor that effectively increase throughput even when a delay increase occurs due to a cause other than congestion in the network. The data transmission device (11) is provided with a transmission unit (60) which transmits to a user terminal (30) data requested over a network (20). The data transmission device includes a transmission rate control element (51C) which controls the transmission rate on the basis of the degree of congestion detected by a congestion detection element (51B) during delay measurement by a delay measurement processing unit (40), and a reference value correction processing element (51D) which temporarily corrects the detection criteria used by the congestion detection element; when it has been determined that the delay has increased due to a cause other than congestion. This reference value correction element increases the accuracy of detection processing by the congestion detection element, thereby improving throughput.

Abstract: An apparatus, a method, and a program for managing content delivery by which a content is able to be delivered by an optimum delivery variation for the user even when the delivery condition of the content varies with time are provided. The content delivery management apparatus prospects a delivery condition at each of a plurality of future times for a plurality of content delivery variations respectively, and sends a delivery condition data including a correspondence relation between the prospected delivery condition and the plurality of future times to a user terminal.

Abstract: A contents playback apparatus and the like are provided which allow a user to promptly designate a desired portion when displaying a part of a content in an expanded manner, and are thus excellent in operability. A contents playback apparatus includes an associating unit and a playback unit. The associating unit generates association information for a plurality of characteristic portions contained in a content by referring to priority orders of the respective characteristic portions relative to each other, the association information associating each of the characteristic portions individually with a predetermined operation key of an input device included in the apparatus in accordance with the priority orders. The playback unit plays back, in response to detecting an operation of an operation key during display of the content, the characteristic portion corresponding to the operation key in an expanded display mode, in accordance with the association information.

Abstract: This system 1 accepts content marker information including content identifier information, and executes a process of causing a storing device to store the content marker information. The system accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. Upon acceptance of a content marker output request, the system transmits content marker information extracted based on the accepted sharing-user identifier information, to user equipment 2a, 2b. Upon acceptance of the content transmission request based on the content marker information, the system determines whether to transmit content data to the user equipment based on stored viewing permission information.

Abstract: This system 1 accepts content marker information including content identifier information for identifying content, and executes a process of causing a storing device to store the accepted content marker information. The system 1 accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. The system 1: accepts a content marker output request that includes user identifier information for identifying a user and that is a request for an output of content marker information; based on the user identifier information included in the accepted content marker output request and the accepted sharing-user identifier information, extracts content marker information corresponding to the user identifier information from the stored content marker information; and outputs the extracted content marker information.

Abstract: This system 1 accepts content marker information including content identifier information, and executes a process of causing a storing device to store the content marker information. The system accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. Upon acceptance of a content marker output request, the system transmits content marker information extracted based on the accepted sharing-user identifier information, to user equipment 2a, 2b. Upon acceptance of the content transmission request based on the content marker information, the system determines whether to transmit content data to the user equipment based on stored viewing permission information.

Abstract: This system 1 accepts content marker information including content identifier information for identifying content, and executes a process of causing a storing device to store the accepted content marker information. The system 1 accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. The system 1: accepts a content marker output request that includes user identifier information for identifying a user and that is a request for an output of content marker information; based on the user identifier information included in the accepted content marker output request and the accepted sharing-user identifier information, extracts content marker information corresponding to the user identifier information from the stored content marker information; and outputs the extracted content marker information.

Abstract: A deleted cache determining part determines a cache data which is to be deleted from a data storing part in a case where a sum of a data amount of a data which is recorded to the data storing part and a data amount of a cache data which is stored to the data storing part and a data amount of a buffer data which is stored to the storing part is equal to or more than a predetermined threshold, and an accumulated data control part deletes the cache data which is determined by the deleted cache determining part from the data storing part.

Abstract: A content information display device includes a content list display unit that creates content list information to be presented to a user by a user terminal based on content information stored in a content delivery server. The content display unit creates the content list information based on the storage state of contents in a cache for delivering a content to the user terminal.

Abstract: A reduction in network load as well as an increase in speed of response through caching and an increase in communication efficiency through buffering are both achieved. A data storage control system that temporarily stores and controls data exchanged between a user terminal 1 and an online storage device 3 includes a storage unit 24 that temporarily stores receive data read from the online storage device 3 by the user terminal 1 and transmit data to be written in the online storage device 3 by the user terminal 1, and a data transmission unit 12 and a data control unit 23 that cause new storage of the transmit data in the storage unit 24 to wait in a case where a volume of the transmit data stored in the storage unit 24 is greater than a threshold value and/or in a case where an elapsed time from a last access to the receive data that is planned to be deleted next time among the receive data stored in the storage unit 24 is shorter than a threshold value.

Abstract: A contents playback apparatus and the like are provided which allow a user to promptly designate a desired portion when displaying a part of a content in an expanded manner, and are thus excellent in operability. A contents playback apparatus includes an associating unit and a playback unit. The associating unit generates association information for a plurality of characteristic portions contained in a content by referring to priority orders of the respective characteristic portions relative to each other, the association information associating each of the characteristic portions individually with a predetermined operation key of an input device included in the apparatus in accordance with the priority orders. The playback unit plays back, in response to detecting an operation of an operation key during display of the content, the characteristic portion corresponding to the operation key in an expanded display mode, in accordance with the association information.

Abstract: A deleted cache determining part determines a cache data which is to be deleted from a data storing part in a case where a sum of a data amount of a data which is recorded to the data storing part and a data amount of a cache data which is stored to the data storing part and a data amount of a buffer data which is stored to the storing part is equal to or more than a predetermined threshold, and an accumulated data control part deletes the cache data which is determined by the deleted cache determining part from the data storing part.

Abstract: An apparatus, a method, and a program for managing content delivery by which a content is able to be delivered by an optimum delivery variation for the user even when the delivery condition of the content varies with time are provided. The content delivery management apparatus prospects a delivery condition at each of a plurality of future times for a plurality of content delivery variations respectively, and sends a delivery condition data including a correspondence relation between the prospected delivery condition and the plurality of future times to a user terminal.

Abstract: This system 1 accepts content marker information including content identifier information, and executes a process of causing a storing device to store the content marker information. The system accepts sharing-user identifier information for identifying a user/users who shares/share the stored content marker information. Upon acceptance of a content marker output request, the system transmits content marker information extracted based on the accepted sharing-user identifier information, to user equipment 2a, 2b. Upon acceptance of the content transmission request based on the content marker information, the system determines whether to transmit content data to the user equipment based on stored viewing permission information.

Abstract: A content delivery device and method is provided to deliver content data from a server to a user terminal in response to a download request of content data input by the user terminal. It implements a first transmission step which retrieves content data, sets a low initial value as a transmission data rate and transmits content data to the user terminal based on a first transport protocol adopting a slow start algorithm gradually increasing the transmission data rate and a second transmission step which retrieves content data and transmits content data to the user terminal based on a second transport protocol adopting a high-speed algorithm setting a higher transmission data rate than the transmission data rate set by the slow start algorithm, wherein the second transmission step is performed to start transmission of content data but the first transmission step is performed after a transmission parameter of the second transmission step reaches a threshold.