An electronic device attached to a user's skin is provided to determine a user emotion based on measured bio-signals. An image corresponding to the determined emotion is displayed. The electronic device includes a skin-attachment apparatus having a bonding unit for bonding to a user's skin and a bio-signal sensor that measures the bio-signals of the user. A display unit and a controller are connected with the skin-attachment apparatus. The controller determines the user emotion based on the bio-signals acquired from the bio-signal sensor and operates the display unit to display at least one of a color and a pattern corresponding to the determined emotion.
