Multipoint video conference device and controlling method thereof

According to the present invention, by receiving, by a transceiver, videos from each of a plurality of clients, decoding, by a first processor, the plurality of videos, mixing, by a second processor, the plurality of decoded videos into a multipoint video, encoding, by the first processor, the multipoint video, multiplexing, by the first processor, the encoded multipoint video into a plurality of multipoint videos, and transmitting, by a transceiver, each of the plurality of multipoint videos to the plurality of clients, it is possible to dramatically reduce a CPU load for video quality calibration and mixing for large capacity videos, reduce video a processing delay time, and provide a higher quality multipoint conference video to a user by performing the video quality correction function, which is performed in the CPU, by using a higher-grade GPU in video processing.