To provide information suitable for specifying music requested to a karaoke device from other request device.

Each request device 5 is informed that music is registered or updated in a musical performance history list every time the music is requested to the karaoke device 3 or the music is performed (s270, s310). The request device 5 notified thereof requests a web page showing a user music list to the karaoke device 3, and the web page transmitted from the karaoke device 3 is displayed on a display part 58, in response to the request.