1. An image display method for displaying a combined image of a vehicle, the method comprising: capturing images corresponding to areas surrounding a vehicle using a corresponding plurality of cameras fixedly mounted to the vehicle; calculating a plurality of displacement vectors for a plurality of points on each of the images captured by the cameras upon the application of a load to the vehicle sufficient to change an attitude of any of the plurality of cameras on the vehicle; determining image borderlines between two adjacent images such that a difference in the directions of displacement vectors in the neighborhood of each image borderline does not exceed a predetermined angle; combining the captured images into a virtual top-view image of the vehicle; and displaying the virtual top-view image on a display device.