| 摘要 |
When a map display system acquires first map data on an area of a predetermined range with a first display scale, the map display system also acquires second map data on an area of a larger range including the predetermined range with a second display scale at the same time. When the acquired first map data on the area of the predetermined range becomes insufficient since a first map displayed on a display means is scrolled, a map obtained by changing the display scale of the second map data to the first display scale is displayed. This provides the map display system which is controlled so as to efficiently acquire map data suitable for acommunication type navigation system.
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