Display device displays a character string of lyrics and accompaniment information. Characters or unit words of the lyrics corresponding to a current performance position and a next performance position are displayed in different display styles, in accordance with progression of the performance. Pieces of the accompaniment information corresponding to the current performance position and the next performance position may be displayed in different display styles, in accordance with the progression of the performance. Thus, even when the characters or unit words of the lyrics corresponding to the current and next performance position are displayed in an overlapping condition, a user is allowed to readily distinguish between the overlapping characters or unit words.