Further, FIG. 4C illustrates a situation where a face region 160 a of the speaker, detected by the face region detector 160, is separately displayed on the screen, and FIG. 4D illustrates an image of a video signal displayed by differentially quantizing the face region 160 a and non-face regions by the quantizer 200. [0054]FIGS. 5A and 5B illustrate examples of images displayed on the screen, to w