The disclosure relates to a communication technique for convergence between an IoT technology and a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system thereof. The disclosure may be applied to intelligence services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. The disclosure provides a coverage improvement method for a PDCCH in a wireless communication system.