Patent ID: 8224570

Claim:
An on-vehicle map display apparatus, comprising: a map scale setting unit that sets a map scale; a summary map generation unit that generates a summary map by abbreviating shapes of road links, if a map scale that is less than a predetermined scale is set by the map scale setting unit; a summary map display control unit that displays the summary map generated by the summary map generation unit upon a display monitor; a congestion information acquisition unit that acquires a plurality of congestion information for each of the road links; a combination unit that combines together a plurality of congestion information that satisfies a predetermined combination condition among the congestion information that has been acquired for each of the road links by the congestion information acquisition unit, the plurality of congestion information including congestion information for a first road link and a second road link, the first and second road links being separated from each other by an intervening road link whose congestion information is not combined in the plurality of congestion information; and a congestion information display control unit that displays the congestion information that has been acquired by the congestion information acquisition unit and combined by the combination unit as superimposed upon the summary map displayed upon the display monitor by the summary map display control unit.