PURPOSE: To move freely a sound image synchronously with the movement of a coordinate on a pattern in the two-dimension or three-dimension sound field space by allowing a listener itself no input the sound image movement in a listening room in real time.

CONSTITUTION: The relation of coordinates between the listening room on the reduced pattern and the actual listening room is coincident one to one to each other, and the listener inputs a desired sound image position on a reduced listening room displayed on a coordinate display means 6 by using a coordinate input means 5 while moving the position in real time. Simultaneously, the coordinate inputted in real time by the coordinate display means 6 is displayed continuously. Each ROM 8 to which a selector is made correspondent definitely in response to each sound image coordinate inputted in real time is selected. Thus, optional sound image movement is attained and the effect of sound image movement is improved.