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According to the innovative development of digital information technology, our society is evolving to NGN that combines the diverse telecom and broadcasting network into a converged network. For various NGN services, it needs to open network resources to 3rd party service providers. And then, service providers enable to develop and provide more converged services with open API technology. In this paper, we define the architecture and Geocoding APIs that supported the location address of mobile subscriber. And we provide the concept and control flow of the family finder on TV services by using Geocoding API. Finally, we describe the effects of Geocoding API comparing to the existing location service model.