Recently, the interest in a Mobile Office is increasing dramatically and the Smart Phone App Service begin in earnest to be requested in an area of applying SAP system to PC. This study aims to research the system which can be easily implemented with the configuration and Mobile App which cause difficulties in embodying SAP system-based Apps suitable for a mobile environment. First, by realizing SAP system interface that can operate in mobile devices in the form of GUI, assisting the connecting parts of SAP for the users-friendly set-up, providing the communication method of Client, Application, and SAP Service in the form of web service through TCP/IP, and finally showing cases of implementing the method of delivering the data request and result value of Server and Client in the form of XML suggest more effective and new method, the research suggests a new way of making the linkage of SAP more efficient.