To provide a relatively small display with low resolution capable of displaying score information which a user needs in an easy-to-see way, and displaying a whole score.

A cursor 80 of the display device for performance information indicates a current performance position (a current position). In a display screen 50, a score in a focus display region 100 in a periphery of the current position is enlarged and displayed, the score in a part of an affected display region 106 around the region 100 is distorted, and the score in a non-enlarged/contracted region 104 apart from the focus display region 100 is displayed in a normal size.