| 摘要 |
A display mode switching function unit recognizes one-click or double-click of an operating dial and switches a menu mode display image, an [H Scroll] mode display image, a [V Scroll] display image and a [Zoom] mode display image. When the [H Scroll] mode display image is displayed, an image display control function unit recognizes clockwise or counterclockwise rotation of the operating dial 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 recognizes clockwise or counterclockwise rotation of the operating dial and causes a map image to be scrolled up or down. When the [Zoom] mode display image is displayed, the image display control function unit recognizes clockwise or counterclockwise rotation of the operating dial 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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