TELEPHONE MAIN DEVICE HAVING TELEVISION CONFERENCE FUNCTION

PROBLEM TO BE SOLVED: To provide a telephone main device having a television conference function, capable of efficiently performing video data distribution processing for television conference and for monitoring other than television conference.SOLUTION: A telephone main device 1 accesses a video box corresponding to each extension line terminal participating in the television conference to receive video data, performs synthesis processing on a plurality of received video data, stores the synthesized video data into a distribution video box 19, and allows each extension line terminal participating in the television conference to access the distribution video box 19 to distribute the video data for television conference.