A system that allows information of MPLS layers to be reported to PW layers by providing a function having a correlation between MPLS layers and PW layers. A PE uses MPLS (Multi-Protocol Label Switching) tunneling and label technology to map a communication service to MPLS, thereby providing bidirectional services on an end-to-end basis. a communication system comprising the PE to perform label assignment control for bidirectional services, the PE to transmit, after completion of assignment control, a message in which the LDP message used in assignment control is a payload and a tunnel-directed label (L2) used by bidirectional services is a header and the PE to associate, on the basis of the received LDP message used in assignment control, a service-directed label (P1) included in the LDP message with the received tunnel-directed label (L2) in the part where the message is terminated.