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The aim of this paper is to propose a metadata-net as ontology to make a relation with similar metadata by analyzing structure and semantics of multimedia content metadata. Also, it is to suggest a multimedia contents management system based on a metadata-net (M2SM) as a methodology to provide integrated services for managing and searching various multimedia contents created and stored in home network-accessible consumer electronics (CEs). The proposed system helps users, who use a mobile device outside home, search and view highly relevant multimedia contents. When user wants to search some multimedia contents by metadata, M2SM provides query extension and modification and restriction using metadata-net in order to reduce increasing searching time caused by traversing unnecessary CEs in home network. The proposed system was implemented on a home server that acts as a gateway for establishing connections between home network and Internet. It supports various standards about home network and controls CEs to manage and search multimedia contents. In this way, M2SM reduces the search results delivered to mobile devices from home network, so power efficiency of mobile devices increase because CPU and network usage are declined.