A method and system for implementing information interaction in a Next Generation Network are disclosed. The method comprises that: a Service Control Function (SCF) sends a location query request message to a ID/Locator Mapping Functional Entity (ILM-FE); the ILM-FE feeds back to the SCF a location query response message, which includes location information and/or information about a characteristic of an IP connection session accessing the service control function. The service control layer utilizes ID/locator separation technology to control the service layer, and uses the characteristic that the user identifier does not change along with the mobile location to provide a rapid transmission location management for a terminal in a moving process. Thus, the service control based on a user identifier is implemented in the NGN, and the continuity of user service is assured when the IP address of the user changes due to the mobility or the multihoming.