Patent ID: 8761456

Claim:
A road estimation device configured to receive data including a core point from an external object, the core point being assigned along a road and being assigned with attributes for identifying the road, the road estimation device further configured to extract a link pertinent to a road represented by the core point for estimating the road on a map, the road estimation device comprising: a map data input device configured to input map data including links having attributes corresponding to the attributes of the core point; and a processor cooperatively operable with the map data input device, and configured to in a link narrowing down unit, narrow down the links into a candidate link being candidate of the road represented by the core point from the map data, according to the attributes of the link and a shape-relevant attribute of the attributes of the core point, the shape-relevant attribute being relevant to a road shape, wherein the link narrowing down unit is further configured to: set a search area for the core point; extract links in the search area; and narrow down the links into the candidate link according to parallel road information being the shape-relevant attribute.