Further, at the first display device 3, a virtual vehicle of the own vehicle that performs lane change is displayed as a moving image of a virtual image 54. Similarly, at the second display device 4 as well, a virtual vehicle of the own vehicle that performs lane change is displayed as a moving image of a virtual image 54′. Since the virtual images 54, 54′ are displayed similarly to the cases in FIGS. 16A to 16C and FIGS. 17A to 17C, description thereof will not repeated.