To clearly present a listening position where a a listener can obtain suitable sound image control effects, by providing a listening position specifying means for visually clearly presenting the listening position where the listener obtains the suitable sound image control effects.

First and second laser devices 301 and 302 are provided on a speaker 100 for a left channel and third and forth laser devices 303 and 304 are provided on the speaker 200 for a right channel. The respective laser devices 301-304 adjust an emitting direction based on emitting direction control information sent from a control part and then, emit laser beams for prescribed time. Thus, the laser beams are emitted from the laser devices 301 and 303 to the left ear position L of the suitable listening position P. Also, the laser beams are emitted from the laser devices 302 and 304 to a suitable right ear position R. Thus, the listener recognizes the suitable listening position (left ear position and right ear position).