Patent ID: 8830142

Claim:
A head-mounted display (HMD) comprising a first body and a second body, wherein: the first body comprises: a display unit configured to display visual information; a first communication unit configured to transmit/receive data; and a processor configured to control the display unit, a sensor unit, a camera unit, the first communication unit, and a second communication unit; and the second body comprises: the camera unit configured to sense an image; the second communication unit configured to transmit/receive data; and the sensor unit configured to detect an input signal and transmit a result of the detection to the processor, wherein the second body is detachable from and mountable to the first body, wherein the processor is further configured to: display a first content when the second body is mounted to the first body; detect a signal when the second body is detached from the first body; and display a second content in response to the detected signal indicating detachment of the second body, wherein the second content corresponds to an image preview interface of an image sensed through the camera unit included in the detached second body, wherein the processor is further configured to display a mounted-mode indicator when the second body is mounted to the first body, and wherein, when the second body is re-mounted to the first body after being detached from the first body, the processor is further configured to: display the second content if the camera unit is in an activated mode, and display the first content if the camera unit is in a deactivated mode.