An assistance
control system (100) containing a map
database (4) storing map information and executing an assistance control to cause a moving object to move to a destination based on map information, the assistance
control system comprising an
electronic control unit configured to: generate or update the map information based on an input from a sensor attached to the moving object, to identify a large number of
route candidates to the destination, to assess the security of the map information for each location or section and to calculate a map information assessment value, to evaluate the accuracy of the assistance control on the identified
route candidates based on the calculated map
information evaluation value, to set a priority for a
route candidate with a lower rating among the route candidates higher than the priorities of other route candidates, to present a route candidate with the highest priority among the route candidates to an occupant of the moving object, or to steer the moving object along the route candidate with the highest priority, and update the map
information evaluation value as a result of the movement of the moving object along the route candidate with the highest priority, and lower the priority of the route candidate with the highest priority based on an amount of change in the map
information evaluation value within a predetermined time, wherein, when the number of times the moving object has moved along the route candidate having the highest priority is equal to or greater than a predetermined number of times, the
electronic control unit may be configured to determine whether the amount of change between the map information evaluation value before the movement of the moving object and the map information evaluation value after the movement of the moving object is equal to or less than a first predetermined amount, and lower the priority of the route candidate having the highest priority when the
electronic control unit determines that the amount of change is equal to or less than the first predetermined amount.