Patent ID: 6943819

Claim:
A cellular phone comprising: a picture input means for receiving a picture stream such as a camera; a picture coding means for coding the input picture stream to prepare the coded picture information to be transmitted; a picture transmission means for transmitting the coded picture information to a network by use of the multicast; a picture receiving means for receiving the picture information transmitted by use of the multicast; picture decoding means for decoding the received data; picture display means for displaying the decoded picture stream; middle participation notice means for notifying the middle participation in a meeting; middle participation terminal detection means for* detecting the terminal that participates in the meeting in the middle, and for supplying the information to said picture coding means; and a communication means for controlling the communication between said cellular phone and a base station, wherein said picture coding means receives the detection signal from said middle participation terminal detection means and changes the coding format to the in-frame coding format, on the other hand said communication means, in addition to communication control between cellular phone and said base station, transmits the compressed and coded picture data and the compressed and coded voice data to the network, receives the compressed and coded picture data and the compressed and coded voice data from the network, furthermore transmits said middle participation notice signal to the network, and receives said middle participation notice signal from the network.