| 摘要 |
<p>A display mode switching function unit recognises one-click or double-click of an operating dial (4) and switches a menu mode display image (30), an [H Scroll] mode display image (32), a [V Scroll] display image (33) and a [Zoom] mode display image (34). When the [H Scroll] mode display image (32) is displayed, an image display control function unit recognises clockwise or counterclockwise rotation of the operating dial (4) and causes a map image to be scrolled right or left. When the [V Scroll] mode display image is displayed, the image display control function unit recognises clockwise or counterclockwise rotation of the operating dial (4) and causes a map image to be scrolled up or down. When the [Zoom] mode display image (34) is displayed, the image display control function unit recognises clockwise or counterclockwise rotation of the operating dial (4) and causes a map image to be displayed on an enlarged or reduced scale. Thus, display control of a displayed image is carried out without providing additional operating keys.
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