Abstract: There is provided a radio mobile terminal device which makes a connection via an interface automatically connectable to a transmission side or a reception side even when one of the interfaces of the reception side is disabled for connection. The radio mobile terminal device includes a telephone number management unit (112) for managing a telephone number and a terminal type of a partner registered in advance and a dual terminal judgment unit (113) for judging whether the terminal device of the partner is a dual terminal. When a user performs a transmission operation, the telephone number management unit (112) and the dual terminal judgment unit (113) judge whether the partner is a dual terminal and, if a dual terminal, they perform transmission to a telephone number corresponding to the two radio interfaces of the partner.

Abstract: A video server in which each media segment file sever (MSFS) stores media segment files (MSFs) forming video data, and sequence control brokers (SCBs) installed between the video server and subscribers terminals receive video requests from the subscriber terminals, and read out the requested MSFs from the MSFSs. The readout MSFs are exchanged by an ATM switch to be transmitted to the SCBs respectively, which outputs the MSFs at predetermined intervals to the request-sender subscriber terminals.

Abstract: A flow control device constructed at a switch device for connecting a plurality of ring networks for exchanging data of a cell among the ring networks. A user device for transmitting a cell carrying data is connected to each ring network, and it can transmit cells within a window counter number.