A display device including a display configured to display content; and a controller configured to capture an image of the displayed content, transmit data of the captured image to an external server, receive content information and a playback time point of the content corresponding to the captured image from the external server, acquire a presence or absence of shopping information related to the displayed content based on the received content information and the playback time point of the content, and display the shopping information on the display according to the acquired presence of the shopping information.