The disclosure relates to a communication method and system for converging a 5G communication system for supporting higher data rates beyond a 4G system with an IoT technology. The 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 or connected car, healthcare, digital education, retail, security and safety-related services. Various embodiments of the disclosure may provide a session management method of a terminal in a mobile communication system. A method performed by a SMF entity in a wireless communication system includes receiving, from an AMF entity, a first message for requesting a PDU session configuration, determining whether the configuration of the PDU session is allowed, and transmitting, to the AMF entity, a second message for establishing the PDU session in case that the configuration of the PDU session is allowed.