A user terminal device, and a method of controlling a user terminal device are discussed. The user terminal device includes an ear accessory of the user terminal device including a first electrocardiogram (ECG) electrode contacted with an ear of a user, a second ECG electrode contacted with a hand of the user, and a first speaker configured to output an audio signal; a display; and a controller configured to display, on the display, bio information based on a first ECG signal from the first ECG electrode when the ear of the user is contacted with the first ECG electrode, and control an audio playback in response to a second ECG signal from the second ECG electrode when the hand of the user is contacted with the second ECG electrode.