1. In a satellite communications multi-point video transmit system including a center station and a plurality of remote stations, a method for communicating video data and speech data between said stations, comprising the steps of: transmitting signals for requesting an interaction from said remote stations to said center station on a terrestrial line in a sequential manner; in said center station, receiving said signals for requesting an interaction from said plurality of remote stations each received signal including a video signal containing a speech signal, and buffering said received signals; selecting one of said buffered signals for requesting an interaction sent from said plurality of remote stations; synthesizing in said center station said selected one of said buffered signals with another video signal which said center station is to transmit to produce a synthesized signal; and transmitting said synthesized signal from said center station to said plurality of remote stations through a communication satellite.