After or before the automated driving control unit 7 of the automated driving system 2 determines to perform lane change to the opposing lane and causing the display control unit 5 to display prior notice of FIG. 16A, the automated driving control unit 7 can detect approaching of an oncoming vehicle 57 on the opposing lane 52. When the automated driving control unit 7 determines that it is necessary to stop once on the cruising lane 51 before performing lane change and wait passing of the oncoming vehicle 57, the automated driving control unit 7 instructs the display controller to display a position for the temporal stop and prior notice necessary therefor.