To allow easy recognition of a corresponding relation of a position of a keyboard to be played and a position of a playing guide in a displayed keyboard image.

In an electronic musical instrument 100, a CPU retrieves the range of the music to be played stored in a music memory, generates the appropriate keyboard image which can be displayed as large as possible based on the marks M1 and M2 provided in the keyboard in order to indicate the positions of the keys corresponding to reference pitches C4 and C5 and on the range of the retrieved music data, transmits the same to a television receiver 200 and displays the same.