Resource management method and device in wireless communication system

A resource management method performed by a first communication node in a communication system, the resource management method comprising:

• generating at least one higher layer signaling signal including first information and second information for resource configuration of an integrated access and backhaul (IAB) node that is a lower node of the first communication node;
• transmitting, to the IAB node, the at least one higher layer signaling signal;
• and
• performing communication with the IAB node based on a multiplexing communication determined by the IAB node based on at least one of the first information and the second information,
• wherein the multiplexing communication is a communication based on multiplexing of an IAB-mobile terminal (MT) and an IAB-distributed unit (DU) constituting the IAB node, and whether frequency division multiplexing is applied to the multiplexing communication of the IAB-MT and the IAB-DU is determined based on at least one of the first information and the second information.