To obtain a television system and its method in which a viewer selects other different camera angle and audio program given to audio and video signals of a different service without deviating tuning from a primary channel.

Audio, video and control data are transmitted as a packet data stream having control data to designate a pre-assigned channel (e.g. channel 10 for network X). A set top terminal 70 receives and processes the data stream according to a command of the user. Control data in the data stream are used to provide an on-screen graphic display on a television receiver and then the user selects a valid camera angle and an audio program without changing the television channel in the case of viewing, e.g. a sports event like a football game.