A method and device for measuring channel quality in a communication system are disclosed. An operation method of a terminal includes the steps of: receiving, from a serving base station, first configuration information for a basic measurement operation; receiving, from the serving base station, second configuration information for a relaxed measurement operation; measuring channel quality for the serving base station by performing the basic measurement operation by using the first configuration information; and, when the condition for the relaxed measurement operation is satisfied, measuring the channel quality for the serving base station by performing the relaxed measurement operation by using the second configuration information.