Guide route generation device and guide route generation process

Guiding route generating device characterized in that it comprises: a memory means which, as a route storing a guiding route generated based on specification of a position, which is used in the modes of a route; a display device that displays the information stored in the memory means guiding route to roads in the periphery of the guiding route; means for determining routes specified, which determines whether, based on a passage of a user specification road among the displayed roads with the guide route is usable as a part of a route from a starting point to an end point of the guiding route or not; a generating means which generates an alternative route for a non-usable position of the road if the road specified to pass, is determined by the specified means for determining routes as unusable; and an updating means that updates a part or the whole of the data stored in the storage device guidance route to the route which the ...