The present invention relates to an image output device mounted on a vehicle so as to implement augmented reality, and a control method therefor. At least one from among an autonomous vehicle, a user terminal, and a server of the present invention can be linked with an artificial intelligence module, a drone (unmanned aerial vehicle, UAV), a robot, an augmented reality (AR) device, a virtual reality (VR) device, a device related to a 5G service, and the like.