A mobile terminal comprising: a wireless communication unit configured to receive sentence-structured content from an external source; a touchscreen configured to display the content including semantic component units; and a controller configured to: analyze the semantic component units of the content, predict responses to the content based on the analyzed semantic component units, display, on the touch screen, icons corresponding to the respective predicted responses, receive a touch input applied to a first icon among the icons, display text (710a, 710b) including a first constituent unit corresponding to the predicted response associated with the first icon in response to the touch input on the first icon, characterized in that the controller is further configured to: display a second constituent unit (711, 713) with the first constituent unit, the second constituent unit corresponding to the analyzed semantic component units of the content, receive a second touch input applied to a second icon among the icons, and display as part of the text a third constituent unit corresponding to the predicted response associated with the second icon in response to the touch input on the second icon, wherein the text comprising the first constituent unit, the second constituent unit and the third constituent unit corresponds to at least one of a subject of the content, an object of the content, a verb of the content, an adverbial phrase of the content and a predicate of the content. a wireless communication unit configured to receive sentence-structured content from an external source; a touchscreen configured to display the content including semantic component units; and a controller configured to: analyze the semantic component units of the content, predict responses to the content based on the analyzed semantic component units, display, on the touch screen, icons corresponding to the respective predicted responses, receive a touch input applied to a first icon among the icons, display text (710a, 710b) including a first constituent unit corresponding to the predicted response associated with the first icon in response to the touch input on the first icon, analyze the semantic component units of the content, predict responses to the content based on the analyzed semantic component units, display, on the touch screen, icons corresponding to the respective predicted responses, receive a touch input applied to a first icon among the icons, display text (710a, 710b) including a first constituent unit corresponding to the predicted response associated with the first icon in response to the touch input on the first icon, characterized in that the controller is further configured to: display a second constituent unit (711, 713) with the first constituent unit, the second constituent unit corresponding to the analyzed semantic component units of the content, receive a second touch input applied to a second icon among the icons, and display as part of the text a third constituent unit corresponding to the predicted response associated with the second icon in response to the touch input on the second icon, wherein the text comprising the first constituent unit, the second constituent unit and the third constituent unit corresponds to at least one of a subject of the content, an object of the content, a verb of the content, an adverbial phrase of the content and a predicate of the content. display a second constituent unit (711, 713) with the first constituent unit, the second constituent unit corresponding to the analyzed semantic component units of the content, receive a second touch input applied to a second icon among the icons, and display as part of the text a third constituent unit corresponding to the predicted response associated with the second icon in response to the touch input on the second icon, wherein the text comprising the first constituent unit, the second constituent unit and the third constituent unit corresponds to at least one of a subject of the content, an object of the content, a verb of the content, an adverbial phrase of the content and a predicate of the content.