Abstract: A controller of a central air conditioning system controls a damper provided for a first target space according to a target temperature. After a predetermined period of time has elapsed since control of the damper provided for the first target space was started according to the target temperature, the controller determines: an association between the controlled damper and the temperature sensor that has detected the changed temperature is correct when a changed temperature detected by a temperature sensor approaches the target temperature in the first target space; and the association between the controlled damper and the temperature sensor that has detected the changed temperature is incorrect when a temperature detected by the temperature sensor does not approach the target temperature in the first target space. Then, the controller outputs a result of determination.

Abstract: A method of controlling a central air conditioning system includes, when a first air volume determined based on humidity in each of a plurality of rooms is less than a second air volume determined based on air quality in the room, causing a conveyor to convey air with a second air volume determined for a first room to the first room and convey air with a third air volume to a second room other than the first room, the third air volume being obtained by correcting the first air volume determined for the second room.

Abstract: A communication terminal (6a, 6s, 6L) includes the following functional units. A relay communication establishment unit (621) establishes communication paths via respective relay devices (4a to 4N, 6p, 6q). A communication processing unit (624a) performs communication for pieces of divided data via the relay devices. A communication state monitor unit (622) changes a current set of the relay devices to a new set of relay devices so as to be used for the communication, based on estimation results of communication states.

Abstract: An intercom notifies a television connected via a network of an occurrence of an event. The intercom includes an event message generating unit that generates an event message indicating the occurrence of the event and including media information indicating media of event information that is obtainable by the television and that is associated with the event, and a communication unit that transmits the event message to the television via the network.

Abstract: A communication terminal (6a, 6s, 6L) includes the following functional units. A relay communication establishment unit (621) establishes communication paths via respective relay devices (4a to 4N, 6p, 6q). A communication processing unit (624a) performs communication for pieces of divided data via the relay devices. A communication state monitor unit (622) changes a current set of the relay devices to a new set of relay devices so as to be used for the communication, based on estimation results of communication states.

Abstract: A communication device searches for a desired communication device and requests a service, without being conscious of the status of the power supply of other communication devices on a network, and achieves a reduction in power consumption. The communication device includes a main processing unit to process main service provided for other communication devices, a network processing unit to transmit and receive a request packet and a response packet among other communication devices, and an integrated power supply unit to stop supplying power to the main processing unit in a state of being able to supply it again and to supply the power to the network processing unit.

Abstract: A communication apparatus in the present invention is an intercom (103) that notifies a television (101) connected via a network (120) of occurrence of an event, and includes: an event message generating unit (132) that generates an event message (320) indicating the occurrence of the event and including media information indicating media of event information that is obtainable by the television (101) and that is associated with the event; and a communication unit (131) that transmits the event message (320) to the television (101) via the network (120).

Abstract: A communication device includes: an address administration unit that manages data link layer addresses; and an ARP processing unit that processes an ARP protocol. The ARP processing unit includes an ARP receiving unit, an ARP transmitting unit, a duplication detecting unit, a duplication notification generating unit and an update GARP generating unit. The update GARP generating unit transmits a GARP and thereby updates the ARP tables of the communication devices on the same network, in order to solve a problem in which communication is interrupted.

Abstract: A low cost communication apparatus enables detection of an apparatus present on a different network in a router multistage network having a plurality of routers. When a communication apparatus cannot detect, on a network thereof, a desired apparatus, the communication apparatus requests a connection support server securing communication paths with all the apparatuses on a home network, to relay an apparatus detection request. The connection support server transfers the request to relay the apparatus detection request, to an arbitrary apparatus belonging to a different network from the network to which the communication apparatus belongs, and the arbitrary apparatus, by proxy, performs an apparatus detection, and transfers information about a detected apparatus to the connection support server. By obtaining the information from the connection support server, the communication apparatus detects the apparatus on the different network.

Abstract: A communication apparatus which is capable of performing bi-directional communication via a router in a local network including one or more routers is provided. An upper segment determination section obtains address range information under an upper router which is connected on an external network side of a router to which the communication apparatus is connected. A terminal communication path holding section connects and holds a communication path to another communication apparatus in the local network. A message relay section relays a communication message from the other communication apparatus.

Abstract: The present invention improves the reliability and safety of communication in a communications system wherein communication is relayed. When an on-premise terminal 100 sets relay information, such as NAT information or the setting information of a packet filter, in a gateway 110, the relay information is set after confirming whether the NAT information for which a setting attempt is being made duplicates the NAT information of another on-premise terminal 101. The same applies to the case of deleting relay information. If the NAT information is duplicate, then interference with the communication of the other on-premise terminal 101 is prevented by modifying the relay information for which a setting attempt is being made, specifically the port number of the gateway 110 on a global network 001.

Abstract: A communication apparatus (10) transmits to a server (001) three address information, check requests 1 to 3 whose destination port numbers are set to be [SP1] and whose source port numbers are set to be respective [LP1] to [LP3] different from each other. The communication apparatus (10) also transmits a P2P communication preparation packet whose source port number is set to be one of [LP1] to [LP3], to a destination different from the server (001), between the address information check requests 1 and 3. The communication apparatus (10) determines the NAT characteristic of a router (101) based on port numbers [GP11], [GP12] and [GP14] of the router (101) notified of by address information check responses 1 to 3.

Abstract: A communication device includes: an address administration unit that manages data link layer addresses; and an ARP processing unit that processes an ARP protocol. The ARP processing unit includes an ARP receiving unit, an ARP transmitting unit, a duplication detecting unit, a duplication notification generating unit and an update GARP generating unit. The update GARP generating unit transmits a GARP and thereby updates the ARP tables of the communication devices on the same network, in order to solve a problem in which communication is interrupted.

Abstract: A communication device, a communication system and an authentication system for preventing a disguising act by an illegal man-in-the-middle and improving the safety and certainty of authentication processing are provided. A slave (20) transmits an authentication request including device information to a master (10). The master (10) receives the authentication request and displays the device information included in the authentication request on a screen of a display section (13). The user visually checks the device information displayed on the screen of the display section 13 (13), determines whether or not to verify the authentication, and instructs the master (10) of the determination result via an input section (14). The master (10), instructed to verify or not to verify the authentication, transmits a response in accordance with the instruction to the slave (20).

Abstract: There is provided a communication device which can search for a desired communication device and request a service, without being conscious of the status of the power supply of other communication devices on a network, and achieve a reduction in power consumption.

Abstract: Provided is a communication terminal capable of establishing a P2P communication path with a communication terminal connected to a different private network. A communication terminal (10) transmits and receives messages to and from a server (30) via a router (11), thereby examining a relay characteristic of the router (11). When the examined relay characteristic of the router (11) is Port Reuse, the communication terminal (10) determines address information, which contains at least a port number of the communication terminal (10), which port number is to be used for P2P communication with a communication terminal (20), to be address information about the router. The communication terminal (10) exchanges the determined address information about the router (11) with the communication terminal (20). Based on the exchanged address information, the communication terminal (10) establishes a P2P communication path with a communication terminal (20).

Abstract: A communication apparatus which is capable of performing bi-directional communication via a router in a local network including one or more routers is provided. An upper segment determination section (421) obtains address range information under an upper router which is connected on an external network side of a router to which the communication apparatus is connected. A terminal communication path holding section (425) connects and holds a communication path to another communication apparatus in the local network. A message relay section (424) relays a communication message from the other communication apparatus.

Abstract: The NAT type of a router can be examined by communicating with one server having one IP address, and a P2P communication path is established efficiently using the NAT type obtained by the examination. A terminal 100 transmits a plurality of port number examination request packets having a plurality of port numbers of a server 001 set as the destination port. The terminal 100 refers to a port number examination response packet received from the server 001 to acquire a plurality of port numbers obtained by address translation by a router 101 for the port number examination request packets respectively. The terminal 100 determines the NAT type of the router 101 based on the acquired translated port numbers. The terminals 100 and 200 establish a P2P communication path efficiently using the determined NAT type.

Abstract: To provide, without requiring a user to have special knowledge or to pay a high cost, a communication apparatus which enables detection of an apparatus present on a different network in a router multistage network comprising a plurality of routers. When a communication apparatus (101) cannot detect, on a network thereof, a desired apparatus, the communication apparatus requests a connection support server (001) securing communication paths with all the apparatuses on a home network, to relay an apparatus detection request. The connection support server (001) transfers the request to relay the apparatus detection request, to an arbitrary apparatus belonging to a different network from the network to which the communication apparatus (101) belongs, and the arbitrary apparatus, by proxy, performs an apparatus detection, and transfers information about a detected apparatus to the connection support server (001).

Abstract: A communication apparatus includes a global address information acquiring section for acquiring first global address information, a WAN-side address information acquiring section for acquiring first WAN-side address information, and a local address information acquiring section for acquiring first local address information. Moreover, the apparatus includes an address information notification section for notifying the first global address information, the first WAN-side address information, and the first local address information to a communication partner apparatus. Furthermore, the apparatus includes an address information acquiring section for acquiring second global address information, a second WAN-side address information, and a second local address information assigned to the communication partner apparatus.