<p>When a surround sound is set, operation buttons (11a) for setting the surround sound and operation buttons (11b) for setting a listening position which are such that setting contents mutually act on setting results are displayed on a setting section (11) at the same time, and in operation determination control and display selection determination control, display based on the surround sound and the listening position is displayed on an illustration section (12) of a touch panel display (10).</p>
