With the prevalence of the Internet, we have been able to cross the geographical barriers, enjoy the convenience brought by information exchanges, and develop the unprecedented applications, such as the most typical example, e-commerce. NSS facing EC will be a very important subsystem during the process of EC development. This paper introduces the current research situation about NSS, stresses on the whole system architecture and key technologies, sets forth solution scheme about some important problem, such as multiparty cooperation text technology and inter-stream synchronization. Our goal is to develop a NSS prototype and to test its feasibility in the E- Marketplaces. It also creates a user-friendly interface for Graphic User's Interface (GUI). The implementation prototype system demonstrates excellent performance and the system can be easily implemented in a large bargain database of the EC marketplace for wide accessibility.