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Industry develops new technologies and adopts them to improve products and processes. Since IT has an important effect on products, processes, organizations, it brought changes to overall industry. Service sectors improve processes or develop new business models using IT, such as ERP, electronic data processing method. This paper's purpose is to identify which technologies drive innovation in the service sector by focusing on the healthcares service and financial service, by analyzing the interaction between technologies and services. Through analyzing patent, we attempt to figure out which service sector develops technology actively, or adopts passively from suppliers. Korean and Japanese patent data are collected and analyzed by network analysis and quantitative analysis. We try to measure the technological activities by searching keywords of service, and by comparison of IPC subclasses. The results of the analysis give an understanding of technological activities and technology networking in the service sector. Implications and future research directions for sustainable growth in the service industry are discussed at the end.