The present disclosure relates to a communication technique for combining, with IoT technology, a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system therefor. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, security and safety related services, and the like based on 5G communication technologies and IoT-related technologies. The present disclosure discloses a method and an apparatus for efficiently transmitting and receiving a downlink control channel in a CA environment.