A wearable device according to various embodiments may include a display configured to allow external light toward a first surface to go through a second surface opposite to the first surface, and having a display area on the second surface, a memory for storing instructions, at least one camera, and at least one processor configured to, when executing the instructions, display content on the display area of the display, detect an external entity using the at least one camera, recognize the external entity as a controller for controlling the content having one designated shape of a plurality of designated shapes, identify a posture change of the external entity recognized as the controller, a gesture input for the external entity recognized as the controller, or a combination thereof using the at least one camera, and control the content, based on the identification.