Abstract: When a menu image transition occurs from a first hierarchical level to a second hierarchical level and to a third hierarchical level, boundary lines B1 and B2, which are near but not in contact each other, are displayed on a display screen to divide it into three areas, R1, R2, and R3. A triangle mark is displayed in area R1 to indicate that there is a higher hierarchical level. Areas R1 and R2 allow the user to recognize that there are the first and second hierarchical levels which are higher. Information (for example, thumbnail images) corresponding to the third hierarchical level is displayed in area R3.