A navigation system is disclosed, which comprises:an evaluation information acquisition unit (11) that is adapted to acquire evaluation information for each unit interval having a predetermined distance, the evaluation information being an index for evaluating a driver's driving operation of a vehicle;an evaluation unit (12) that is adapted to determine, based on a first scale of a map displayed on a display unit, a first distance of an evaluation interval for evaluating the driver's driving operation and evaluates the driver's driving operation in the evaluation interval having the first distance based on the evaluation information for each unit interval included in the evaluation interval; anda display control unit (13) that is adapted to perform control so that an evaluation result by the evaluation unit is displayed at a position corresponding to the evaluation interval on the map displayed on the display unit.;The navigation system according to claim 1, wherein:the evaluation unit (12) is adapted to evaluate the driver's driving operation in each unit interval based on the evaluation information for each unit interval; andif the evaluation results in all evaluation intervals that constitute a travel route of the vehicle are the best evaluation results but if the travel route includes a non-best unit interval whose evaluation result is the non-best evaluation result, the display control unit (13) is adapted to perform control to provide a guidance on the non-best unit interval.
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