A Head Mounted Display (HMD) device includes a display configured to display an augmented reality effect in relation to an Electromyography (EMG) device. The HMD device also includes at least one processor configured to control the display of the augmented reality effect in relation to the EMG device according to a user motion detected by the EMG device. The HMD device may further include a communication unit configured to communicate with the EMG device, and the at least one processor may be configured to receive, from the EMG device via the communication unit, information about data stored on the EMG device. At least some of the received information may be displayed in relation to the EMG device as the augmented reality effect. Information sent from the EMG device to a mobile terminal may be displayed in relation to the EMG device as the augmented reality effect.
