11. The apparatus of claim 9 , wherein the user query is described in an XML format in the query representation unit.
11. The apparatus of claim 9 , wherein the user query is described in an XML format in the query representation unit. 12. The apparatus of claim 11 , wherein the query analysis unit includes: an XML parser for parsing the user query to thereby produce a parsing result; a descriptor processor for processing the indicator and the reference based on the parsing result of the XML parser; a meaning analyzer for analyzing a meaning of the user query by using the processed indicator and reference which are obtained in the descriptor processor.