Public warning system method of transmitting the key information to the terminal and a network entity

A wireless communication system transmitting the key information to the terminal PWS method and a network entity, wherein the method includes: the terminal is attached to the process network, the network entity transmits the key information to the PWS terminal. Another method includes: security mode command is performed between the terminal and the network (SMC) process, the network entity transmits the key information to the PWS terminal. The network entity comprising: a Public Warning System (PWS) key storage module for storing key information PWS; PWS key transmission means for transmitting the key information to the PWS terminal. The present invention may be in a wireless communication system, the PWS key information sent to the terminal for storage. Later, when the PWS terminal receives the alarm message sent by the network, to the PWS warning message can be verified by the security key stored in the PWS.