The purpose of this paper is to suggest dasgnosis support system for diseases of mind so that users can make effective decisions without professional knowledge by developing effident knowledge system and utilizing ontology with which questions and logic inference are possible to diagnose diseases of mind Ferthermore, this diagnosis support system could be applied to supplement previous diagnosis method which technical knowledge. As a result of this experiment, diagnosis support system for diseases of mind was found to be accordance with the result of consulting instructions and show additional relevance thru utility extension.