The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a first base station, information associated with a deactivation of a cell group of a second base station, determining whether to deactivate the cell group of the second base station based on the information, and transmitting, to the first base station, a first message for the deactivation of the cell group of the second base station in case that the cell group of the second base station is determined to be deactivated.