Methods and network entity for sending public warning system (PWS) key information to terminal

Disclosed are methods and a network entity for sending the PWS key information to a terminal. One method includes that the network entity sends the PWS key information to a terminal when the terminal is attached to a network. The other method includes that the network entity sends the PWS key information to the terminal when a safe mode command (SMC) process is performed between the terminal and the network. The network entity comprises a PWS key information storing module and a PWS key information sending module, wherein the PWS key information storing module is used for storing the PWS key information, and the PWS key information sending module is used for sending the PWS key information to the terminal. The methods and the network entity can send the PWS key information to the terminal for storage in a wireless communication system. When the terminal receives a PWS alarm message sent by the network, the stored PWS key information can be used to perform safety verification on the PWS alarm message.