A method of controlling a head mounted display (HMD) according to one embodiment of the present specification includes the steps of detecting a first contact contacted with a nose pad of the HMD, detecting a second contact contacted with a temple of the HMD, if the first contact and the second contact are detected, operating in a wearing mode to activate a display unit and an audio input unit, if the first contact is not detected and the second contact is detected, operating in a mute mode to activate the display unit and inactivate the audio input unit, and if the first contact and the second contact are not detected, operating in a non-wearing mode to inactivate the display unit and the audio input unit.