Driving assist system

A driving assist system comprising:

• a data obtainer configured to:
• obtain, from each of a plurality of vehicles, a driving feature data item sampled at each predetermined sampling point on a travelling route of the corresponding vehicle, the driving feature data items obtained from each of the plurality of vehicles being based on at least one of at least one driver's operation to the corresponding vehicle, and at least one behavior of the corresponding vehicle;
• a first storage unit storing, as historical driving data items, the driving feature data items that have been previously obtained from each of the plurality of vehicles, the historical driving data items obtained from each of the plurality of vehicles having been sampled at the respective sampling points on the corresponding travelling route;
• a driving evaluator configured to:
• compare the driving feature data item sampled at each predetermined sampling point and obtained from a target vehicle included in the plurality of vehicles with the historical driving data items for the corresponding sampling point stored in the first storage unit;
• and
• obtain, based on a result of the comparison, an evaluation value of the driving feature data item for the target vehicle at each predetermined sampling point, the evaluation value of the driving feature data item for the target vehicle at each predetermined sampling point representing a degree of alienation of the driving feature data item from the historical driving data items at the corresponding sampling point;
• a second storage unit configured to store the evaluation value of the driving feature data item for the target vehicle at each predetermined sampling point;
• and
• an unusual driving determiner configured to:
• obtain a cumulative sum of selected values in the evaluation values of the driving feature data items for the target vehicle, the selected values corresponding to respectively selected sampling points included in the sampling points;
• determine whether the cumulative sum of the selected values in the evaluation values of the driving feature data items for the target vehicle is larger than a predetermined threshold;
• and
• determine that driving of a driver of the target vehicle is unusual upon determining that the cumulative sum of the selected values in the evaluation values of the driving feature data items for the target vehicle is larger than the predetermined threshold.