1. A method for analyzing an emotional state of a user in an image display device, the method comprising: displaying a scene from content, the scene including identification information and related additional information; receiving information related to a user response to the displayed scene; determining an emotional state of the user based on the received information; storing the determined emotional state such that it is associated with the identification information; and displaying the additional information on the scene based on the emotional state such that different additional information is displayed according to different emotional states.