A communication method and system for converging a 5th-generation (5G) communication system for supporting higher data rates beyond a 4th-generation (4G) system with a technology for internet of things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology. The method of a terminal in a wireless communication system are provided. The method includes receiving information, which is related to a first transmission time and a second transmission time of an uplink signal of a terminal, from a base station, when the uplink signal of the terminal is configured in an unlicensed band, performing a channel access in the unlicensed band, and when the unlicensed band is not in an idle state based on a channel access result before the first transmission time, performing a channel access until the second transmission time.