Segment determination device and segment determination method

A segment determination device comprising:

• an altitude information acquisition unit configured to acquire altitude information about a plurality of points on a road on which a vehicle travels;
• and
• a feature amount determination unit configured to determine a feature amount that indicates gradient information about the road based on the altitude information about points including a first point ahead of the vehicle in a traveling direction of the vehicle and a second point further ahead of the first point among the plurality of points,
• wherein the altitude information acquisition unit acquires altitude information about another plurality of points until the feature amount determined by the feature amount determination unit is outside of a predetermined range, the another plurality of points including a point farther from the vehicle than each of the plurality of points used for determining the feature amount by the feature amount determination unit, and
• wherein the segment determination device further comprises a segment determination unit configured to, in a case where the feature amount is outside of the predetermined range, determine a segment in which the first point is set as a start point and whichever of two points adjacent to the second point that is closer to the vehicle is set as an end point.