For solving problems inside enterprise or research groups, it is essential to utilize specific knowledge in the field of the problems. Thus, finding expert persons who have pertinent knowledge is a key for solving the problems. If group is small, it is easy to find out appropriate experts by hand. Otherwise, under the situation number of experts is greater than several hundreds, it is difficult. In this study, using "JST Scientific and Technological Thesaurus" and hierarchical tagging, we developed an expert finding system. We attempted to totally improve the retrieval precision using "JST Scientific and Technological Thesaurus". And, applying hierarchical tagging, we aimed to enhance the retrieval precision in the case that one expert versed in several fields.
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