Parking support systems and methods for use with a vehicle obtain image data from an imaging device provided on the vehicle. The systems and methods output an image on a display on the basis of the image data, generate a predicted course line on the basis of a steering angle of the vehicle on the image, and generate a vehicle width guide line indicating a vehicle width on the image. The systems and methods determine whether the vehicle is in an enter-starting state in which the vehicle is about to enter a parking target area and, when it is determined that the vehicle is in the enter-starting state, extend the vehicle width guide line in a rearward direction of the vehicle.