Abstract
In the early stage, service system had been implemented with a functionality point of view on designing or implementing system. Because service had been designed to bring functionality into focus, critical issue that it must modify all structure of service system when service was adding or modifying had occurred sometimes. New technology, SOA that designs system with a service-oriented point of view has introducing to solve problem. That is, when it designs business service system, it designs with a business process or service point of view and reuse the legacy application program or resources. Therefore, this paper proposes the SOA-based business collaboration system for e-Business or u-Business and the needed component. Also, it explains how to compose the component about one service among various business services. To do this, it firstly analyzes modules operated at the legacy e-business service systems and redefines those functions with service point of view. And it recomposes the defined process or service with SOA concept. It designs components with CBD method in order to reuse legacy application resources. Hereby, resource reusability is maximizing. As service engine is composed of CBD-based component, it is easy to migrate new service to the proposed system. And legacy system's modification will be minimized because of reusing the legacy modules and providing interface adaptor.