Mobile communication method and device for broadband system

Disclosed are a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G communication system, and a system therefor. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety-related services, and the like) based on 5G communication technology and IoT-related technology. An operating method of a base station, includes configuring a terminal to perform a serving cell channel measurement for a serving cell and a neighbor cell channel measurement for a neighbor cell, and transmit to the base station a first report of the serving cell channel measurement and a second report of the neighbor cell channel measurement, the configuring including configuring a measurement gap for the neighbor cell, based at least in part on a determination that a first frequency corresponding to the serving cell and a second frequency corresponding to the neighbor cell are different from each other; receiving, from the terminal, the first report based at least in part on the serving cell measurement being performed by the terminal; and receiving, from the terminal, the second report based at least in part on the neighbor cell channel measurement being performed by the terminal.