A picture transmitting apparatus transmits, to a picture receiving
apparatus, a picture as a predetermined area of an omnidirectional
picture. The picture receiving apparatus displays a portion of the
transmitted picture which corresponds to a viewpoint. When the viewpoint
is moved, information of the movement is transmitted from the picture
receiving apparatus to the picture transmitting apparatus, and a picture
corresponding to the new viewpoint is transmitted from the picture
transmitting apparatus to the picture receiving apparatus. The picture
receiving apparatus displays a portion of the received picture which
corresponds to the viewpoint.