A network binding method and network binding system

The related network adhesion method comprises: arranging address information for connecting IP multimedia sub-system in a user-attributed server, then, A. terminal starts request to an adhesion process network element; B. the element executes the adhesion operation for the terminal, and obtains the address information from former server; C. the element allocates temporary mark for terminal, and sends user IP address and address connection IP multimedia sub-system to terminal; and D. terminal registers the IP multimedia sub-system according to received addresses. This invention registers IMS when adhering network, and can receive called calling from IMS domain.