An operation method of a first communication node in a vehicle-to-everything (V2X) communication system may include: receiving, by the first communication node, control information including resource allocation information from a second communication node; receiving, by the first communication node, data from the second communication node through a radio resource indicated by the resource allocation information included in the control information; generating, by the first communication node, sidelink control information (SCI) including reception configuration information indicating the radio resource used for transmission of the data by the second communication node based on the resource allocation information; and transmitting, by the first communication node, the SCI to a third communication node.