10. A question type and domain identifying method, the method comprising: recognizing a number of words of a user's question to identify whether the user's question is a query for performing information searching or a question for performing a question and answer; distributing one of plural preset domain specialized question and answer engines, as a question and answer engine of the user's question, based on the recognized word number; and selectively performing information searching or a question and answer with respect to the user's question by using the domain specialized and question and answer engine distributed as the question and answer engine, wherein said recognizing the number of words of a user's question includes classifying the user's question as the query for information searching when the recognized word number is one, checking whether a predicate or postposition is included in the user's question when the recognized word number is two or more, classifying the user's question as a natural language question when the predicate or postposition is included in the user's question; and classifying the user's question as the query or a keyword array type question based on the question and answer type identification result when the predicate or postposition is not included in the user's question.
12. The method of claim 10 , wherein said distributing one of plural preset domain specialized question and answer engines distributes a domain with respect to the user's question based on a law dictionary previously established for each domain or a learning model established through analyzing the language of learning data and through mechanical learning of learning quality.