In accordance with an embodiment of the invention, how power sleep mode (Power Saving Mode, hereinafter PSM) of the terminal operation control in a mobile communication system, the method comprising: setting the PSM to the terminal, and triggers a connection request of the subscriber station in PSM ( trigger) step, if the connection request is blocked (barred) that this step and the connection request block to judge that it is possible to provide a method and an apparatus characterized in that it comprises the step of holding the set PSM.