Abstract: A correlative reacting system and a method for implementing security update of mobile station. The correlative reacting system includes a security correlative agent at a terminal side and a security correlative server at a network side communicated with the security correlative agent via an air interface. In the present invention, the correlative reacting system performs an information interaction with the mobile station, controls the mobile station to carry out an automatic security update. The automatic security update includes automatic downloading and installation, update of the security correlative agent, and automatic recovery of the insecurity factors of the mobile station and the like.

Abstract: This invention provides a method and system for network security control. A server at the network side analyzes local security correlation information collected and reported by terminal devices, and determines a security strategy according to the result of the analysis. Since correlative reacting between the network side and the terminal side is implemented and the security strategy is established according to the information from the terminal devices, threats against security from a terminal device can be resisted from the beginning. A relative large number of information sources can be taken into account when determining the security strategy such that the determined security strategy is more reasonable and accurate. Furthermore, a differential security service can be provided for terminal devices with different subscriber levels. This invention also provides a method and system for preventing junk mails based on the concept of correlative reacting between a terminal and a server.