The present disclosure relates to a communication technique for converging IoT technologies with a 5G communication system for supporting a higher data transfer rate beyond the 4G system, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, security and safety related services, etc.) on the basis of 5G communication technologies and IoT-related technologies. Further, the present disclosure provides a method and device for setting the maximum number of MIMO layers for each bandwidth part in a next-generation mobile communication system.