A determination unit that determines whether a vehicle is in a lane change state where the vehicle is going to make a lane change from a travelling lane to a recommended lane; and a display control unit that causes a display unit to display the front image on which a guide line is superimposed, wherein the guide line has a front end point and a rear end point, are provided. In the lane change state, the display control unit sets a position of the rear end point in the front image such that the rear end point indicates a central position in a width direction of the vehicle, and, not in the lane change state, the display control unit sets a position of the rear end point in the front image such that the rear end point indicates a central position in a width direction in the travelling lane.