A method of controlling a head mounted display (HMD) according to one embodiment of the present specification includes performing a first operation, receiving a first voice input through an audio input unit, processing the first voice input with respect to the first operation while a first contact is detected through a first sensor positioned at a nose pad of the HMD, detecting the first contact being released through the first sensor positioned at a nose pad of the HMD, receiving a second voice input through the audio input unit while the first contact is released, and performing a second operation according to the received second voice input.