In recent years, the application of ontology has been already toward the diversification under the development of the semantic web technology. The main application of ontology is information retrieval. With the utilization of ontology, we expect to offer more correct information for users. Although, most of the applications of ontology are information retrieval but they lacks of the interaction with users. As the communicated bridge of the users and the machines, ontology should be upgraded while the information changes. Thus it is an important subject to expand ontology with the changing information. So we propose an automation on-line FAQ (Frequently Asked Questions) system that has the learning ability. We except that the system can reply answers and extend ontology.
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