Patent ID: 7657369

Claim:
A method for producing search data used in an onboard vehicle navigation device to perform a route search based on map data, wherein a road is represented as a set of nodes and road links, and a set of specific nodes and road links is defined as a specific street, the method comprising: receiving a name of a first street; searching for and showing second streets that are connected directly at a node or by a road link to an end point of the first street, a length of the road link being less than or equal to a predetermined distance, wherein the node and the road link are not associated with identifying attribute data; selecting one of the shown second streets; and storing a branch point or an area at which the first street and the selected second street are connected with each other as data for performing a search relating to the first street, wherein when a search is performed for an intersection between the first and second streets, the branch point or area at which the first street and the selected second street are connected with each other is displayed on a display as a destination or a via-point along a guiding route.