This Technical Specification describes a home server conceptual model for multimedia home server systems. A home server conceptual model is specified from the standardization point of view to clarify the functionality and modularity of existing and future home servers. The model provides key technology of home servers to be standardized. It should be noted that the modelling is not intended for actual implementation of home servers. The modelling is expected to be a reference for discussing and developing new works of home server standardization, and to contribute to ease of operation and connectivity of home servers. The model is dealt with as an instance of the equipment structure model defined in IEC 61998.