<p>A display image generation part 134 generates a display image in accordance with a display output mode set by a mode setting part 112. A notification image generation part 116 generates a notification image indicating that the display output mode can be changed. A determination part 114 determines whether or not the conditions for generating a notification image are met. If the determination part 114 determines that the conditions for generating a notification image are met, the notification image generation part 116 generates a notification image. The notification image indicates the operation adapted to change the display output mode.</p>
