11. A device for displaying caption data comprising: a video receiver configured to receive content data including video data; a display configured to display the video data; and a controller configured to: if original caption data is included in the content data, perform error checking for the original caption data and generate corrected caption data by correcting one or more errors of the original caption data, extract one or more high-difficulty words from the corrected caption data, generate a sign language animation corresponding to each of the one or more high-difficulty words, wherein the sign language animation includes explanation data for explaining each of the one or more high-difficulty words, determine at least one special effect corresponding to at least one word included in the original caption data or the explanation data, wherein the at least one special effect includes vibrations, color light, heat, chill, or fragrance corresponding to the at least one word included in the original caption data or the explanation data, and while displaying the video data, simultaneously provide the corrected caption data, the sign language animation, and at least one special effect.
11. A device for displaying caption data comprising: a video receiver configured to receive content data including video data; a display configured to display the video data; and a controller configured to: if original caption data is included in the content data, perform error checking for the original caption data and generate corrected caption data by correcting one or more errors of the original caption data, extract one or more high-difficulty words from the corrected caption data, generate a sign language animation corresponding to each of the one or more high-difficulty words, wherein the sign language animation includes explanation data for explaining each of the one or more high-difficulty words, determine at least one special effect corresponding to at least one word included in the original caption data or the explanation data, wherein the at least one special effect includes vibrations, color light, heat, chill, or fragrance corresponding to the at least one word included in the original caption data or the explanation data, and while displaying the video data, simultaneously provide the corrected caption data, the sign language animation, and at least one special effect. 14. The device of claim 11 , where the controller is further configured to: if a user input for displaying an another language-based sign language animation is received, translate at least a portion of the corrected caption data into an another language-based sign language, generate the another language-based sign language animation based on the translated another language-based sign language, and control the display to display the translated another language-based sign language animation.