Display device and play-back device

摘要

A display device (10) includes a first interface (309), a second interface (311) and a display circuit (313). The display device transmits a first connection confirmation signal to confirm connection, via the first interface to a playback device (11) and receives a response signal in reply to the first connection confirmation signal, transmits a second connection confirmation signal to confirm connection, via the second interface to the playback device and receives a response signal in reply to the second connection confirmation signal, and makes a function to use the first and second interfaces between the display device and the playback device available if both response signals in reply to the first and second connection confirmation signals are received.