The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The disclosure is for controlling congestion of a channel in a wireless communication system According to an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system comprises determining a plurality of granted transmission resources for a sidelink communication, performing a transmission or a retransmission using at least one transmission resource among the plurality of granted transmission resources, receiving an acknowledgement (ACK) for the transmission or the retransmission, in response to the ACK, releasing one or more transmission resources among the plurality of granted transmission resources, measuring a channel occupancy ratio (CR) from transmission resources other than the released one or more transmission resources from the plurality of granted transmission resources, and transmitting a physical sidelink shared channel (PSSCH) to satisfy a condition that the measured CR does not exceed a configured CR limit so that a congestion control is performed.