Hybrid reasoning system based on ontology and method of the same

An ontology-based hybrid reasoning system and a method thereof are provided to offer an intelligent service in the ubiquitous environment by arranging a control agent for controlling the description logic-based reasoning technology and rule-based reasoning technology. A rule logic reasoning unit(340) generates an index file of the SWRL(Semantic Web Rule Language) which is matched with new fact information and an SWRL leading rule. A control agent unit(350) outputs a reasoning performing control signal for performing the description logic-based reasoning. A description logic reasoning unit(360) performs the suitable class relation reasoning for the instance of a data model of an ontology knowledge base(330).