1. A teleconferencing system comprising: a plurality of sound-collection means; at least one speaker-imaging means, an image-display means; and an imaging control means, which, based on voice direction information of a speaker obtained from said sound-collection means, changes an imaging direction of said speaker-imaging means imaging the speaker, wherein said imaging control means is configured so as to perform control so as to direct said imaging direction of said speaker-imaging means toward a direction of said speaker predicted by said sound-collection means, and wherein said imaging control means is configured so that movement pixels are extracted from the captured image, and a distribution of the movement pixels is determined, so as to identify a position of said speaker within said image region, and so that, based on said position information of said speaker, further control is performed of said speaker-imaging control means so that said speaker is displayed at a prescribed position within an image region.