| 摘要 |
Enabling a partial update of data for spot search and improvement of update operation efficiency. The data for spot search is constituted by (a) a plurality of spot search files RF-k having constitutional elements of POI data, (b) a menu display file MNF for displaying a search screen, and (c) an area table TBL. When periphery search is carried out, a mesh code where a spot on map designated by a user belongs is specified on the basis of the menu display file MNF and a search key containing the mesh code is generated. Further, the spot search file RF-k corresponding to the search key is specified on the basis of the area administration table TBL and extracts POI data corresponding to a facility, existing in a periphery of a spot which is designated by the user, is extracted out of the POI data contained in the spot search file RF-k.
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