A display control unit that causes a display unit to display a front image on which a guide line is superimposed, wherein the guide line has a front end point that indicates a position inside a recommended lane and has a rear end point that indicates a position rearward of the front end point, is provided. When the vehicle is in a 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, when the vehicle is 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.