Abstract: An objective is to prevent occurrence of video loop even in a case where a plurality of video conference apparatuses are connected in cascade. In a cascade mode, that is, in a case where a location of a video conference apparatus is an intermediate location, video and speech selector/combiner 105 selects video data of a location (location where a speech is made) of a maximum sound-volume among connection locations other than the location of the video conference apparatus and a cascade destination. Communication controller 103 transmits video data of the location of the maximum sound-volume to video conference apparatus 10 of the cascade destination and transmits the video data transmitted from video conference apparatus 10 of the cascade destination to video conference apparatuses 10 in a connection location other than the cascade destination.

Abstract: An objective is to prevent occurrence of video loop even in a case where a plurality of video conference apparatuses are connected in cascade. In a cascade mode, that is, in a case where a location of a video conference apparatus is an intermediate location, video and speech selector/combiner 105 selects video data of a location (location where a speech is made) of a maximum sound-volume among connection locations other than the location of the video conference apparatus and a cascade destination. Communication controller 103 transmits video data of the location of the maximum sound-volume to video conference apparatus 10 of the cascade destination and transmits the video data transmitted from video conference apparatus 10 of the cascade destination to video conference apparatuses 10 in a connection location other than the cascade destination.

Abstract: A videoconference device displays video data from a speech site such that a viewer can easily understand even in a case where the number of sites is large. A communication controller receives each piece of video data and voice data from conference terminal devices of a plurality of other sites. A video and voice synthesizer determines a screen layout depending on the number of sites participating in a videoconference, and generates synthesized video data obtained by synthesizing video data of each site according to the screen layout. At this time, the video and voice synthesizer generates the synthesized video data such that display of the video data of each site where a level of voice data is higher than or equal to a threshold is highlighted more than display of video data of the other sites. A video and voice output controller displays the synthesized video data on a screen of a display device.

Abstract: A videoconference device displays video data from a speech site such that a viewer can easily understand even in a case where the number of sites is large. A communication controller receives each piece of video data and voice data from conference terminal devices of a plurality of other sites. A video and voice synthesizer determines a screen layout depending on the number of sites participating in a videoconference, and generates synthesized video data obtained by synthesizing video data of each site according to the screen layout. At this time, the video and voice synthesizer generates the synthesized video data such that display of the video data of each site where a level of voice data is higher than or equal to a threshold is highlighted more than display of video data of the other sites. A video and voice output controller displays the synthesized video data on a screen of a display device.

Abstract: A wireless communication terminal includes an encoder, configured to encode content data; a destination setting section, configured to set a network address on feedback data for the wireless communication terminal, the network address being set on the wireless communication terminal; a transmitter, configured to transmit the feedback data; a receiver, configured to receive the feedback data transmitted form the transmitter and transferred by way of the wireless communication network; and a reproduction processor, configured to perform reproduction processing on the content data in accordance with the received feedback data.

Abstract: A wireless communication terminal includes an encoder, configured to encode content data; a destination setting section, configured to set a network address on feedback data for the wireless communication terminal, the network address being set on the wireless communication terminal; a transmitter, configured to transmit the feedback data; a receiver, configured to receive the feedback data transmitted form the transmitter and transferred by way of the wireless communication network; and a reproduction processor, configured to perform reproduction processing on the content data in accordance with the received feedback data.

Abstract: A router, if judging that a routing function is impossible to execute, sends out a connection instruction message including the address of a terminal on a local network terminating the relaying flow, to another router to solicit switching. The router having received the connection instruction message starts a process for connecting with an external network while executing a process for link connection with a terminal, and then sends out a connection completion notice message when the connection with both the external network and the terminal is established. This process enables the router to switch a path rapidly.

Abstract: In a mobile network system composed of plural mobile networks and a home agent, the home agent inquires mobile routers in a mobile network whether or not a terminal is connected, if detecting the absence of the terminal, when data addressed to the terminal arrives at a home network of the terminal in the mobile network. Responding to this inquiry, the mobile routers search whether or not the terminal is connected to the own mobile networks. If the terminal is connected, the mobile routers inform the home agent of the presence of the terminal. When receiving this notice, the home agent transfers data addressed to this terminal to a mobile router as a notice source. This process, even if a terminal moves to a mobile network having a same network prefix as that of the home network, allows transferring a packet accurately to the terminal.

Abstract: In a mobile network system composed of a mobile network with a mobile router and a terminal interconnected, and of a home agent, when the mobile router connects to an external network, the mobile router informs the home agent of path information to the mobile network including the mobile router. Receiving the path information, the home agent inquires the mobile router in the home network whether or not the mobile router connects to the mobile network informed. Then, the home agent advertises path information to this mobile network only when the mobile router connecting to the mobile network does not exist. Accordingly, the home agent can rapidly switch to an optimum path to the external network.

Abstract: In a case where internal links connected to plural mobile routers in a mobile network respectively have unique network identifiers initially set, the mobile router, when receiving a network identifier different from the initial setting advertised from another mobile router, selects either one of the network identifier initially set to the self and that advertised, as a network identifier of the internal link connected to the self. Then, if the one selected is identical to that initially set, the mobile router advertises the network identifier to within the mobile network and registers it in a home agent. If not identical, the mobile router registers the one advertised in the home agent as a network identifier of the internal link connected to the self.

Abstract: A router, if judging that a routing function is impossible to execute, sends out a connection instruction message including the address of a terminal on a local network terminating the relaying flow, to another router to solicit switching. The router having received the connection instruction message starts a process for connecting with an external network while executing a process for link connection with a terminal, and then sends out a connection completion notice message when the connection with both the external network and the terminal is established. This process enables the router to switch a path rapidly.

Abstract: A mobile communication method includes: a step for transmitting a binding update message for notification of a care-of-address of the network where the mobile network has gone, from a mobile router to a home agent, which can be used after the network has moved; and a step performed upon reception of the binding update message, for notification by the home agent of routing information concerning the route to the mobile network managed by the mobile router to the home network. Thus, the routing information from a mobile node is given to a gateway and the router on the home network without delay after movement, and it is possible to prevent loss of data sent to the mobile node belonging to the network to which the mobile network is connected after the movement.

Abstract: When first mobile router, which has a MNP, generates a key which corresponds to that MNP and transmits a registration request packet including the key to home agent, home agent stores the MNP and key of the first mobile router, and sends main mobile router registration approval. When first mobile router receives this response, it distributes the MNP and key to second mobile router in moving network. Second mobile router, which receives this, transmits a registration request packet including the MNP and key to home agent, and thereby, home agent registers second mobile router as a subsidiary mobile router. By this means, it is possible to prevent illegal acquirement of a packet addressed to a moving network by use of a mobile router which shares the network prefix (MNP).

Abstract: A router, if judging that a routing function is impossible to execute, sends out a connection instruction message including the address of a terminal on a local network terminating the relaying flow, to another router to solicit switching. The router having received the connection instruction message starts a process for connecting with an external network while executing a process for link connection with a terminal, and then sends out a connection completion notice message when the connection with both the external network and the terminal is established. This process enables the router to switch a path rapidly.

Abstract: Wireless communication terminals whereby it is possible for users who are acquainted with one another to recognize that the users are approaching one another without revealing private information to a third party.

Abstract: When the routing function of router becomes disabled, a routing stop message is multicast to all terminals and another router in a LAN. If another router can provide the routing function, a routing start message is multicast to all terminals and the other router in the LAN. This method allows the terminals in the LAN to switch the default router at a predetermined timing according to both messages, thus minimizing the default router switching delay time and the packet loss.

Abstract: In a mobile network system composed of a mobile network with a mobile router and a terminal interconnected, and of a home agent, when the mobile router connects to an external network, the mobile router informs the home agent of path information to the mobile network including the mobile router. Receiving the path information, the home agent inquires the mobile router in the home network whether or not the mobile router connects to the mobile network informed. Then, the home agent advertises path information to this mobile network only when the mobile router connecting to the mobile network does not exist. Accordingly, the home agent can rapidly switch to an optimum path to the external network.

Abstract: A router includes a multicast packet transmitting unit that multicasts the identifier of the router periodically, a relay determining unit that determines whether a received data packet should be relayed to a router in another segment, an order determining unit that determines, on the basis of information included in multicast packets from the other routers, the router to which the data packet shall be transferred, and a packet relaying unit that, when the data packet is not relayed, notifies the transmission source which transmitted the packet as to the router selected by the order determining unit to be the relay destination and then transfers the data packet to the selected router. A router suitable for relaying the packet is thus selected. Since switching of the relay router may be performed by following the router redirection message, it is unnecessary to add a new function to a terminal.

Abstract: In a mobile network system composed of plural mobile networks and a home agent, the home agent inquires mobile routers in a mobile network whether or not a terminal is connected, if detecting the absence of the terminal, when data addressed to the terminal arrives at a home network of the terminal in the mobile network. Responding to this inquiry, the mobile routers search whether or not the terminal is connected to the own mobile networks. If the terminal is connected, the mobile routers inform the home agent of the presence of the terminal. When receiving this notice, the home agent transfers data addressed to this terminal to a mobile router as a notice source. This process, even if a terminal moves to a mobile network having a same network prefix as that of the home network, allows transferring a packet accurately to the terminal.

Abstract: Any mobile router or terminal informs a home agent device of a policy of selecting a mobile router, entered by the user. Then, the home agent device creates relay setting information according to the policy information informed and the characteristic information of the mobile routers, and transmits the information to the mobile routers. This relay setting information is for judging whether a packet addressed to the external network, received by the mobile routers is relayed to the external network or transferred to the own network, and if transferring, for determining a transfer destination. Each of the mobile routers relays a received packet according to its relay setting information, thus implementing communication reflecting a user's intention as needed.