The present disclosure relates to a communication technique that fuses, with IoT technology, a 5G communication system for supporting higher data transmission rates than 4G systems, and a system thereof. The present disclosure can be applied to intelligent services (such as smart home, smart building, smart city, smart car, or connected car, health care, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. The present disclosure relates to a method and an apparatus for performing synchronization using previous synchronization information where the previous synchronization information may be information about synchronization that is lost when the terminal turns off a radio frequency module to enter a low power mode.