Multicast meeting unit and multicast meeting program

摘要

The invention provides a television meeting unit that is capable of displaying a picture smoothly on a middle participation terminal. To realize such television meeting unit, the multicast meeting unit is provided with a picture coding means for coding an input picture, a picture transmission means for transmitting the coded picture by mean of multicast, a picture receiving means for receiving the transmitted coded picture, a picture decoding means for decoding the received picture, a picture display means for displaying the decoded picture, a middle participation notice means for notifying middle participation in a meeting, and a middle participation terminal detection means for detecting the middle participation notice and for transmitting it to the picture coding means. The picture coding means, upon receiving the middle participation notice from the middle participation terminal detection means, changes the coding format to the in-frame coding format.