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Multimedia service users can require multiservices according to their own environment for accessing to public networks. For copying with customer-oriented service requirements, network providers have to prepare multi-layer service networks. This paper deals with frame relay, ATM and IP networking services on multi-layer networks. In order to provide multiple data services, network provider needs to define and make use of client-server and interworking relationships between these networks. In this paper, we propose a servuce management architecture in order to efficiently manage multiple services and network resources from service point of view. The proposed service management architecture includes functionalities such as subscription management, customer-network management, communication session management, and business layer support management. Especially, it describes an information model for managing multi-layer networks by way of the interworking or clientserver relationship. The proposed functionalities are modeled in accordance with the object-oriented modeling concept and implemented on a CORBA platform. The applications on the proposed architecture include VPN services and various statistical services for customers and the carrier. The realized system is to be used for Koera Telecom's high speed networks mainly for supporting Internet services.