8. The video apparatus of claim 5 , further comprising: an input unit through which the first content is received; a demultiplexer configured to divide the received first content into main content and sub-content; an audio/video processor configured to process the divided main content to provide video and/or audio data; and a metadata separator configured to extract metadata from the sub-content, wherein the keyword extracting unit extracts the keywords from the extracted metadata.
8. The video apparatus of claim 5 , further comprising: an input unit through which the first content is received; a demultiplexer configured to divide the received first content into main content and sub-content; an audio/video processor configured to process the divided main content to provide video and/or audio data; and a metadata separator configured to extract metadata from the sub-content, wherein the keyword extracting unit extracts the keywords from the extracted metadata. 9. The video apparatus of claim 8 , wherein the video data and the generated keyword list are selectively displayed.