In an audiovisual system in which a TV, an AV amplifier, a DVD player and the like are combined, another device constituting the system is automatically set to an optimal operation state according to the content recorded on an optical disc. A reproduction content judging unit 406 of a DVD player 400 judges the type (a video signal and an audio signal) and the format of signals included in content that has been read from the optical disc 401. According to the results of judging by the reproduction content judging unit 406, a control unit 403 of the DVD player 400 sends an instruction signal related to the power supply state and an instruction signal related to output of at least one of video and audio to a control unit 105 of a TV 100 and a control unit 203 of an AV amplifier 200.