The present disclosure relates to: a communication technique for converging an IoT technology and a 5G communication system for supporting a higher data transfer rate beyond a 4G system; and a system therefor. The present disclosure can be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or connected car, health care, digital education, retail business, security and safety-related service, etc.) on the basis of a 5G communication technology and an IoT-related technology. The present invention relates to a method for transmitting uplink control information (UCI) by a terminal in a wireless communication system, the method comprising: receiving physical uplink control channel (PUCCH) configuration information from a base station; and transmitting, to the base station, UCI in a PUCCH to which PUCCH format 1 has been applied on the basis of the PUCCH configuration information, wherein the PUCCH configuration information contains spreading code index information, and the spreading code index information is determined on the basis of the length of a spreading code to be applied to symbols through which the UCI is to be transmitted, among symbols through which the PUCCH is to be transmitted.