PURPOSE: To enable a singer to correctly sing a song even when the singer is disabled to correctly sing the song by informing the singer of the correct vocal.

CONSTITUTION: The singer sings the song to an accompaniment reproduced by an accompaniment reproduction part 12. The song sung by the singer and vocal data corresponding to the current reproduced accompaniment which is retrieved in a data base 11 are inputted to a rhythm decision part 26, which decides whether or not the singer sings the song correctly. A vocal transmission part 13 sends the vocal data corresponding to the currently reproduced accompaniment. A vocal reception and reproduction part 14 reproduces the received vocal data. The singer listens to the correct reproduced vocal and sings the song to the vocal to know the rhythm again, so that the singer can correctly sing the song.