The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Provided is a method of transmitting or receiving data by an integrated access and backhaul (IAB) node in a wireless communication system. The method includes receiving resource allocation information from at least one of a first parent IAB node or a second parent IAB node, with the IAB node having dual connectivity to the at least one of a first parent IAB node and the second parent IAB node, receiving information about first resource scheduling from the first parent IAB node, receiving information about second resource scheduling from the second parent IAB node, and transmitting or receiving data based on the resource allocation information, the information about the first resource scheduling, the information about the second resource scheduling, and a link over the first resource scheduling and the second resource scheduling.