PURPOSE: A social network ontology system which supplies ontology deduction based OWL(Web Ontology Language) is provided to supply intelligent search on a social network and to supply ontology deduction based on OWL. CONSTITUTION: An information collecting unit(100) receives information for constituting ontology. A hierarchy structure analyzing unit(110) analyzes information in order to constitute with a network ontology. An ontology manager(150) modifies ontology in an ontology unit. A deducting unit(130) practices the deduction about social network ontology. A system connector(160) is connected to a social network ontology system.
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