Patent ID: 7831389

Claim:
A map evaluation system comprising: a map data storage unit configured to store map data indicating a road map; an absolute position detector configured to detect an absolute position of a vehicle by receiving electric waves from satellites; an on-map position acquisition unit configured to acquire an on-map position of the vehicle using the detected absolute position, the on-map position being based on a road map indicated by the stored map data; a track storing unit configured to store, as travel track information, absolute positions detected by the absolute position detector in association with on-map positions acquired by using the detected absolute positions when the vehicle travels; a map reliability degree setting unit configured to set as a reliability degree of the map data, an error of the map data relative to the travel track information by comparing the travel track information with the map data; and a track reliability degree setting unit configured to set a reliability degree of the travel track information based on a detection accuracy of the detected absolute position, the detection accuracy being variable based on a state where the absolute position is detected; wherein the track storing unit stores the set reliability degree of the travel track information in association with the travel track information, and the map reliability degree setting unit sets the reliability degree of the map data only using travel track information which has a reliability degree exceeding a predetermined reference value.