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The Internet is the largest information repository. Most information retrieval systems are based on the premise that users know the keywords for searching subjects. Web services provide a suitable technical framework for making business processes accessible within enterprises and across enterprises, so that they have promoted a new paradigm of a business process which is called the service-oriented business process. The system then uses a Bayesian network to insert the terms and finish the complete hierarchy of the ontology. The feature of this ontology construction system includes that the PART architecture overcomes the lack of flexibility in clustering, while in the web page analysis, WordNet and Entropy deal with the lack of knowledge acquisition. Empirical results demonstrate that the new design help users with little domain knowledge obtain appropriate keywords.