To notify whether a singer sings at an aimed voice volume level by displaying the aimed voice volume level which the singer should sing at, and by comparing the aimed voice volume level with a voice volume level input by the singing singer from a microphone.

A voice volume level determination system includes: aimed voice volume level setting means 40 setting an aimed voice volume level, which a singer should sing at, of a played karaoke music; aimed voice volume level display control means 41 displaying the aimed voice volume level on a given display 25; input voice volume level detection means 42 detecting an input voice volume level of the singing voice input from a microphone 24; and input voice volume level display control means 43 displaying the input voice volume level on the display 25.