Apparatus and method for paging in wireless communication system

PURPOSE: Paging apparatus and method in a wireless communication system are provided to maximize the effect of the power saving mode of a terminal by determining the reception of paging advertisement messages based on a sub group. CONSTITUTION: An idle operation controlling part(216) transmits paging information containing a registration releasing identification(ID) for an idle mode entered terminal and a paging group ID to a terminal. A paging controlling part(218) uses the registration releasing ID to form a paging message indicator indicating the position of a program which transmits a paging advertisement message. The paging controlling part adds the paging message indicator to the paging advertisement message and transmits the paging message indicator to the terminal.