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 terminal in a wireless communication system is provided. The method comprises receiving, from a first base station associated with a master cell group (MCG), a first radio resource control (RRC) message including a second RRC message generated by a second base station associated with a secondary cell group (SCG), identifying first information indicating a deactivation of the SCG included in the second RRC message, and determining to deactivate the SCG based on the first information indicating the deactivation of the SCG.