22. The apparatus of claim 16 , wherein the annotation parser is configured to write the annotation content into the auxiliary information of the image, and wherein the storage unit stores the image that has the auxiliary information having the annotation content.
22. The apparatus of claim 16 , wherein the annotation parser is configured to write the annotation content into the auxiliary information of the image, and wherein the storage unit stores the image that has the auxiliary information having the annotation content. 23. The apparatus of claim 22 , wherein, upon receiving a request for retrieving the annotation content from the search engine, the annotation parser parses the annotation content from the auxiliary information of the image and returns the annotation content to the user client, or returns the annotation content to the user client through a search engine.