Provided are an augmented reality device for performing a payment by recognizing a payment code and a method of operating the same. The method may include obtaining, based on gaze information of both eyes of the user, a gaze point where gaze directions of the both eyes of the user converge, wherein the gaze information is obtained using at least one gaze tracking sensor; determine a region of interest corresponding to the gaze point on an image obtained through the camera; enlarge the region of interest; recognize a payment code included in the enlarged region of interest; and perform a payment by using the payment code.