In a first aspect, a communication control method is a communication control method in a boundary IAB node. The boundary IAB node has RRC connection with a first IAB donor for controlling a first IAB topology and RRC connection with a second IAB donor for controlling a second IAB topology. The boundary IAB node has F1 connection with the first IAB donor, and does not have F1 connection with the second IAB donor. The communication control method includes receiving BAP header rewriting configuration information from the first IAB donor, receiving a BAP packet from a lower IAB node, performing BAP header rewriting processing for the BAP packet received, based on header information of the BAP packet and the BAP header rewriting configuration information, and performing routing, via the second IAB topology, of the BAP packet for which the BAP header rewriting processing has been performed.