A music score display device displays a music score representing a predetermined piece of music at a display, and stores a playing result for each measure of the music score in a memory when the piece is played. On the basis of the playing results of the measures stored in the memory, the music score display device generates graph images representing the playing results of the measures, and displays the generated graph images of the measures, superposed on images of the corresponding measures of the music score displayed at the display, such that the images of the measures are visible.