2. The system of claim 1 , further comprising: an ontology library, configured to store several concepts which comprise terms commonly accepted in media-related domains and interrelations between the terms; a media library, configured to store a specific media content which has a media ID; and a media subtitle library, configured to record the subtitle information which corresponds to the media content in the media library and is attached to media.
6. The system of claim 2 , wherein: the media ID is a filename of the media (no duplicate filename is allowed), or an index specially allocated to the media, or any other number, text, letter symbol sequence, Uniform Resource Locator (URL) or Uniform Resource Identifier (URI) that can identify the media uniquely.