It is an object of this invention to display the marks obtained by a player corresponding to game scenes by switching between an analog score display and a digital point display. In this invention, a key input detecting means, detects keys input by the player and obtains key operation signals. A correct or incorrect answer determining means, determines whether the answer is correct or incorrect by comparing the key operation signals with the correct input patterns. A point/score calculating means, calculates the marks obtained by the player on the basis of the correct or incorrect answer determination. A point/score display switching means, generates video signals for displaying the marks obtained by the player corresponding to the game scenes, by switching between an analog score display and a digital point display.