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Since the computer era began, companies built various information systems in order to increase efficiency and fulfill the customer requirement. While the number of systems doubled, the number of interfaces linking the systems increased and the interface type became various. Accordingly, the management of interface became a big challenge. This paper suggests SOA as system interface and a step-by-step implementation model of SOA. In addition, a prototype of executing the model is shown for detail explanation. The prototype demonstrates how SOA could increase user convenience.