Poor visibility due to abnormal display caused by occurrence of failure of HUD is reduced using AR-HUD which includes a vehicle information acquiring unit, a controller, and a video display apparatus. The vehicle information acquiring unit acquires various types of vehicle information that can be detected by a vehicle. The controller controls display of a video in a display region visually recognized through a windshield from a driver's seat of a vehicle based on vehicle information acquired by the vehicle information acquiring unit. The video display apparatus generates video based on an instruction from the controller. The controller acquires apparatus information which is used when determining apparatus fault, determines whether the apparatus fault is present or not based on the acquired apparatus information, and performs a display content changing process to change content of the video projected onto the windshield when determined that the apparatus fault is present.