An augmented reality (AR) device according to an embodiment may include: a communication module comprising communication circuitry, a camera, a display, a wear detection sensor, a memory, and a processor. The memory according to an embodiment may include instructions which, when executed by the processor cause the AR device to receive, through the communication module, marker configuration information related to a display form and a display method of a watch face AR marker and configured in an electronic device. The memory according to an embodiment may include instructions which, when executed by the processor cause the AR device to detect, through the wear detection sensor, that the AR device is worn on a user's body and activate the camera. The memory according to an embodiment may include instructions which, when executed by the processor cause the AR device to identify a watch face AR marker and a strap pointing marker included in a camera video, based on the marker configuration information configured in the electronic device. The memory according to an embodiment may include instructions which, when executed by the processor cause the AR device to determine at least one of a location, a posture, and a tilt of the electronic device, based on the identified watch face AR marker and the identified strap pointing marker. The memory according to an embodiment may include instructions which, when executed by the processor cause the AR device to output AR information corresponding to the posture or tilt, based on the location of the electronic device.