A head mounted display, HMD, comprising: a display unit configured to display a digital image; an audio input unit configured to receive an audio signal; an audio output unit configured to convert an electric signal to an audio signal and output the audio signal; a first sensor configured to detect a first contact, wherein the first sensor is positioned at a nose pad of the HMD, and detects the first contact when the nose pad of the HMD contacts a first designated area of a user's head; and a second sensor configured to detect a second contact, wherein the second sensor is positioned at a temple of the HMD, and detects the second contact when the temple of the HMD contacts a second designated area of the user's head; characterized in that a controller is configured to: activate a wearing mode if the first contact and the second contact are detected, wherein the audio input unit and the audio output unit are switched to an active state in the wearing mode, activate a mute mode if the first contact is not detected and the second contact is detected, wherein the audio input unit is switched to an inactive state and the audio output unit is maintained in the active state in the mute mode, activate a non-wearing mode if the first contact and the second contact are not detected, wherein the audio input unit and the audio output unit are switched to an inactive state in the non-wearing mode, switch the wearing mode to the mute mode if the first contact is not detected in the wearing mode, switch the mute mode to the wearing mode if the first contact is detected in the mute mode, switch the mute mode to the non-wearing mode if the second contact is not detected in the mute mode, and switch the non-wearing mode to the wearing mode if the first contact and the second contact are detected in the non-wearing mode. a display unit configured to display a digital image; an audio input unit configured to receive an audio signal; an audio output unit configured to convert an electric signal to an audio signal and output the audio signal; a first sensor configured to detect a first contact, wherein the first sensor is positioned at a nose pad of the HMD, and detects the first contact when the nose pad of the HMD contacts a first designated area of a user's head; and a second sensor configured to detect a second contact, wherein the second sensor is positioned at a temple of the HMD, and detects the second contact when the temple of the HMD contacts a second designated area of the user's head; activate a wearing mode if the first contact and the second contact are detected, wherein the audio input unit and the audio output unit are switched to an active state in the wearing mode, activate a mute mode if the first contact is not detected and the second contact is detected, wherein the audio input unit is switched to an inactive state and the audio output unit is maintained in the active state in the mute mode, activate a non-wearing mode if the first contact and the second contact are not detected, wherein the audio input unit and the audio output unit are switched to an inactive state in the non-wearing mode, switch the wearing mode to the mute mode if the first contact is not detected in the wearing mode, switch the mute mode to the wearing mode if the first contact is detected in the mute mode, switch the mute mode to the non-wearing mode if the second contact is not detected in the mute mode, and switch the non-wearing mode to the wearing mode if the first contact and the second contact are detected in the non-wearing mode.