A model music data inputting unit inputs model music data containing music score display data representing a music score to be displayed of a model music piece for practice, performance data representing a musical performance which coincides with the music score to be displayed, and performance data particularly prepared for playing back with musical emotions the tones of the model music piece for practice. When the practice mode is switched on, the display device displays a music score of the model music piece for practice, and the performance inputted by the user is compared with the performance data coinciding with the music score for evaluation. When the practice mode is switched off, the performance data particularly prepared for playing back the tones with musical emotions are supplied to the tone generator for playing back the tones.