Multi-picture mixing method and apparatus for video meeting system

The present invention relates to a video conference system, and particularly to a multi-picture-mixing method of video conference system and a device thereof. The method comprises the following steps in turn: a. establishing connection between the video conference terminals and a multi-point control unit, transmitting the local audio and video flow and sound condition to the multi-point control unit; b. determining which terminal is a speaking terminal by the multi-point control unit according to sound information, combining the picture of speaking terminal with the pictures of other terminals to one output video flow, and executing special displaying for the picture of speaking terminal; c. transmitting the mixed output video flow to each terminal of video conference by the multi-point control unit; and d. displaying the received output video flow on the display by each terminal of video conference. The invention settles the problem that the sub-screen of each terminal can not determine and display the speaking end in the prior video conference system. The using of conference participators is facilitated and the actual operation effect of system is improved.