separation unit 112 into the image data and audio data and supplies them to the image decoding unit 207b refer to fig2 and audio decoding unit 212b refer to fig2 namely as for the reception data the control data is first separated and is subsequently separated in accordance with the storage station point each station and is further separated in accordance with the data kind and is transmitted to the processing circuit in the local station respectively for the relay transmission the reception data separated every storage station point is supplied to the relay decision and multiplexing unit 106 specifically speaking with respect to the clockwise transmission path in the 5 point communication the data of the communication frame unit transmitted from the tv conference terminal station e 305 is separated into the storage data of the tv conference terminal station d 304 and the storage data and control information of the tv conference terminal station e 305 each of those data is further separated into the image data and audio data although the explanation has been made with respect to the 5 point communication since the number of storage point terminal stations to actually receive the data is equal to 2 the media separation units c 113c and d 113d actually do not operate the multiplexing operation of the multiplexing circuit 100 will now be described the multiplexing control in the media multiplexing unit 101 station point multiplexing unit 102 and control information multiplexing unit 103 is fundamentally executed by the multiplexing control unit 104 the coded image data and audio data are inputted to the media multiplexing unit 101 from the image coding unit 207a refer to fig2 and audio coding unit 212a refer to fig2 in the local station those image data and.