The present disclosure relates to an image output device disposed at a vehicle to enable augmented reality and a method for controlling the same. The image output device includes an image output unit configured to output visual information for realizing the augmented reality, a communication unit configured to receive a forward image that captures an image in a forward direction of the vehicle, and a processor configured to search for at least one planned driving lane on which the vehicle is planned to travel from the forward image and control the image output unit such that a main carpet image indicating the planned driving lane is output in lane units.