2. The apparatus of claim 1 , further comprising: a knowledge database configured to store and maintain a knowledge model of at least one domain knowledge; a behavioral model database configured to store and maintain a user behavior information model including at least one of a user profile of the user, a preference of the user, and a pattern of the user; and a language database configured to store and maintain data with respect to the language that is understandable to the user.
2. The apparatus of claim 1 , further comprising: a knowledge database configured to store and maintain a knowledge model of at least one domain knowledge; a behavioral model database configured to store and maintain a user behavior information model including at least one of a user profile of the user, a preference of the user, and a pattern of the user; and a language database configured to store and maintain data with respect to the language that is understandable to the user. 3. The apparatus of claim 2 , wherein the context recognizing unit recognizes the context of the user through at least one of a retrieval analysis with respect to the user's environment, a logical inference, and a pattern recognition, and combines the collected sensing information with the knowledge model or the behavioral model.