A node according to a packet relay method which enables a multicast transfer or broadcast transfer of a packet effectively is provided. When the node receives a packet set with a multicast address or broadcast address as a destination address from a source client, the packet is added with an MPLS label common to destination clients corresponding to the multicast address or all destination clients corresponding to the broadcast address. The packet added with the common MPLS label is transferred over a ring network. When receiving the packet from a ring network, the node removes a common MPLS label from the received packet to be transmitted to destination clients when it detects that the common MPLS label is added to the received packet.