A method and apparatus can manage power in a mobile communication system according to a call setup in a user equipment. The method can include setting a radio link in response to a setup command, receiving a radio access bearer allocation request command to reset a down link power range, and performing a radio link reconfiguration with the base station; transmitting a down link power measurement request command to adjust the down link power range in response to a down link power measurement result; reconfiguring a radio link in response to the adjusted down link power range. The transmitting and reconfiguring can be repeatedly performed for user equipment. Accordingly, an excessive down link power allocation to a specific subscriber and an abrupt variation of a total down link power can be reduced, and a number of subscribers, who respective cells can accommodate by a call starting control, can be increased.