The present invention relates to an image display device, to an image display system, to a method for analyzing the emotional state of user, wherein information on a user response to a scene containing content is analyzed so as to provide a user with information on the emotional state of the user for the scene or to selectively provide information added for each scene of the content, thereby rendering an interactive service. According to one embodiment of the present invention, the method for analyzing the emotional state of a user comprises the steps of: outputting a scene comprising content having identification information; receiving information on a user response to the scene; determining the emotional state of the user for the scene on the basis of the information on the user response; and storing the determined emotional state in association with the identification information.