To provide a terminal device for reading out a map file not requiring for updating a map file of an adjacent unit when a certain map file is updated.
The map file showing each unit obtained by dividing the map into a plurality of areas includes a node record generated at each node, and a link record generated in each link. The coordinate information of an adjacent node regulating the road connecting relation between the unit and its adjacent unit is recorded in a designated node record. The above map file is stored in a first storage device 19. A data processing part 13 performs the processing for searching for a route using the map file. The data processing part 13 follows the connection from a road in one unit to a road in the other unit according to the coordinate information of the adjacent node of one unit and the other unit in the course of route search process.
IHARA YASUHIRO
KAMIYAMA YOSHIKI
SUZUKI SACHIHIRO
FUKUDA HISAYA
