An optical disk apparatus is configured to switch the audio signals to be output to the sound output terminal by means of the slide switch having contact points that activate in association with the state switched by a mechanical manipulation. When the state of the slide switch is switched to the state where the externally-input audio signal is output to the sound output terminal from the state where the audio signal is output to the sound output terminal, a video signal of a composite video on which the OSD image, indicating that the output is switched to the external signal from the internal signal, is kept output to the video output terminal until a time period has passed.