A displace device for a vehicle includes a display unit and a controller. The controller is configured to: receive an image of a road in which the vehicle is located and trajectory information providing a trajectory of vehicle movement, detect one or more lanes of the road based on the received image of the road, assign weights to (i) the detected one or more lanes and (ii) the trajectory of vehicle movement, respectively, based on a preset reference value, generate a virtual road image providing a direction based on the assigned weights, and control the display unit to display the generated virtual road image.