Before renewal of the necessary all map data ends, until renewal ends, you must wait, even with when we would like to use the navigation device. The ground mapping device has the map data in the map which is formed from plural areas. And, searching the inner specified area of this plural areas, it indicates the map of the area which is searched. First, the frequency calculation section (101), search frequency is calculated concerning plural areas. The renewal section (102), preferring the map data of the area where the search frequency which was required when the map data of plural areas is renewed, the frequency calculation section (101) by is high, it renews. The control section (103), when the map data of the area whose search frequency is high the renewal section (102) with is renewed, before renewing the map data of other area, indication processing of the map data is accepted.
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