Patent ID: 7024307

Claim:
A map evaluation system comprising: a map database storing a road map; map collating means for determining, by collating a road location with a vehicle position path, whether a difference is present between the vehicle position path and the road location and for then generating difference information indicating a location of the difference when the difference is determined to be present, wherein the vehicle position path is detected by a vehicle position detecting unit while the road location is indicated on the road map corresponding to the vehicle position path; difference accuracy information obtaining means for obtaining accuracy information used for determining degree of accuracy for the difference information, wherein the accuracy information includes at least generating-time information indicating a generating time when the vehicle position path is detected; difference accuracy determining means for executing determination of the degree of accuracy for the difference information based on the accuracy information; map evaluating means for executing evaluation of degree of credibility for a portion of the road map based on a result of determination of the degree of accuracy executed by the difference accuracy determining means, wherein the portion of the road map corresponds to the location of the difference; and outputting means for outputting a result of the evaluation of the degree of credibility executed by the map evaluating means.