1. A mobile terminal, comprising: a receiver configured to receive a content signal comprising video data and audio data; a display; and a controller configured to: cause displaying of video on the display based upon the received video data; cause displaying of subtitles on the display simultaneously with the displayed video, wherein content of the subtitles is based upon the received audio data; and cause the subtitles to be displayed in any of a plurality of different formats according to a corresponding sound characteristic of the received audio data, wherein the sound characteristic of the received audio data is one of a plurality of possible sound characteristics.