A vehicular control apparatus (1) is provided with: an obtaining device (3) capable of receiving an electric wave from an electric wave communication base (E10, E20, N10 etc.) which emits the electric wave for providing driving assistance service to a plurality of vehicles which respectively drive on a plurality of service roads (10A, 10B, 10C, 10D, 20A etc.), and of obtaining a plurality of road data (520A, 520B, 520C, 520D) respectively corresponding to the plurality of service roads managed by the electric wave communication base; and a weighting device (140) for applying, to each of the obtained plurality of road data, weighting information indicating importance for specifying one service road that one vehicle enters and indicating importance for providing the driving assistance services in association with the one service road.