Abstract: According to one embodiment, an electronic device includes: a detection unit which detects whether the display device is attached to the electronic device; a wireless communication unit capable of simultaneously advancing information communication via wireless communication channel with a plurality of parties containing transmission of video information to the display device; a wired communication unit which transmits video information to the display device via a wired communication channel when the detection unit detects that the display device is attached to the electronic device; a acquisition unit acquires the device information assigned to the display device via the wired communication channel from the display device when the detection unit detects that the display device is attached to the electronic device; and a communication control unit which controlling the wireless communication unit to preferentially conduct information communication addressed to the device information acquired by the acquisition

Abstract: A communication network system has a plurality of communication terminals, each having a first transmitting unit and a first receiving unit. Information is transmitted and received among the communication terminals through the first transmitting unit and the first receiving unit. At least two of the communication terminals are used as relay terminals. Each of the relay terminal has a second transmitting unit and a second receiving unit for performing only one-to-one-type communication. A received-information relay unit transmits information received from the first receiving unit to the second transmitting unit and transmits information received from the second receiving unit to the first transmitting unit. A relay-terminal-information transmitting unit transmits to the first transmitting unit ID information of the relay terminal and ID information of a terminal to which the relay terminal is providing relay services.

Abstract: A radio communication apparatus including a setting unit which sets specific passphrases respectively onto a plurality of terminal identifiers corresponding to a plurality of communication terminal units on a network, a generation unit which respectively generates a plurality of individual keys corresponding to the plurality of terminal identifiers by using the specific passphrases, and transmission/reception units which carry out transmission/reception with respect to one of the plurality of communication terminal units on the network by using the generated individual key corresponding thereto.

Abstract: A communication network system has a plurality of communication terminals, each having a first transmitting unit and a first receiving unit. Information is transmitted and received among the communication terminals through the first transmitting unit and the first receiving unit. At least two of the communication terminals are used as relay terminals. Each of the relay terminal has a second transmitting unit and a second receiving unit for performing only one-to-one-type communication. A received-information relay unit transmits information received from the first receiving unit to the second transmitting unit and transmits information received from the second receiving unit to the first transmitting unit. A relay-terminal-information transmitting unit transmits to the first transmitting unit ID information of the relay terminal and ID information of a terminal to which the relay terminal is providing relay services.

Abstract: A communication control apparatus is connectable to a communication terminal through a network. The apparatus includes a transmission information holding unit configured to hold transmission information to be transmitted to the communication terminal, and a transmission-right determination unit configured to determine that the transmission information is to be transmitted to the communication terminal with a transmission right being allocated thereto if the transmission information is held in the transmission information holding unit.

Abstract: A communication network system has a plurality of communication terminals, each having a first transmitting unit and a first receiving unit. Information is transmitted and received among the communication terminals through the first transmitting unit and the first receiving unit. At least two of the communication terminals are used as relay terminals. Each of the relay terminal has a second transmitting unit and a second receiving unit for performing only one-to-one communication. A received-information relay unit transmits information received from the first receiving unit to the second transmitting unit and transmits information received from the second receiving unit to the first transmitting unit. A relay-terminal-information transmitting unit transmits to the first transmitting unit ID information of the relay terminal and ID information of a terminal to which the relay terminal is providing relay services. A storage unit stores the information of the relay terminals.

Abstract: A communication network construction method comprises the steps of grouping the communication devices belonging to a communication network into one or a plurality of communication groups. In a selection step, one or a plurality of representative devices are selected in each communication group formed in the grouping step. In a communication step, each communication device communicates directly with the communication devices belonging to the same group, and communicates with the communication devices belonging to a different group by first transmitting data to the representative device of the same communication group and then causing the representative device to transfer a part or the whole of the data to the representative device of the different communication group.

Abstract: A communication network construction method comprises the steps of grouping the communication devices belonging to a communication network into one or a plurality of communication groups. In a selection step, one or a plurality of representative devices are selected in each communication group formed in the grouping step. In a communication step, each communication device communicates directly with the communication devices belonging to the same group, and communicates with the communication devices belonging to a different group by first transmitting data to the representative device of the same communication group and then causing the representative device to transfer a part or the whole of the data to the representative device of the different communication group.

Abstract: A communication terminal apparatus is used in a communication system including at least one first terminal having an optical communication section to optically communicate with one other first terminal and at least one second terminal having a network communication section to communicate with a plurality of other second terminals through a network. In the communication terminal apparatus as a relay terminal, an optical communication section optically communicates with the at least one first terminal. A network communication section communicates with the at least one second terminal through the network. A received information sending section sends information received from the optical communication section to the network communication section, and sends information received from the network communication section to the optical communication section.

Abstract: A communication control apparatus according to the present invention has receive means and own terminal identifier setting means. The receive means receives terminal ID information having information of one or more terminal identifiers transmitted from one or more terminals with which communication is being held. The own terminal identifier setting means sets a terminal identifier among a plurality of terminal identifiers which are other than the terminals of the other terminals obtained from all terminal ID information items received from the receive means, which have been previously set and which can be used for the communication.

Abstract: A plurality of terminals communicate. One terminal belongs to a plurality of groups of terminals. In the communication apparatus, a terminal information memory stores terminal identifiers. A sending section sends the communication information with the terminal identifiers of other terminals participating in one group to the other terminals. A receiving section receives information sent by the other terminal. A group discrimination section compares the received terminal identifiers with the stored terminal identifiers, and discriminates the group from which the received information was communicated according to the comparison.

Abstract: A server collects network administration information of terminals connected to the self-segment, assembles the collected network administration information into packets, and transfers the packets to other segments. The server stores the relationship, as a table, between the low-level layer address of each terminal connected to a corresponding segment and the corresponding high-level layer address on the basis of the collected network administration information and the network administration information included in packets transferred from other segments, and performs packet transfer between terminals through the segments by looking up this table.