A control node in a path control system comprising a network, the control node in a control plane of the network and one or more relay nodes in a user plane of the network, the one or more relay nodes connected to the control node and configured to relay packet communication between user network nodes , wherein the control node is configured to perform path control of the packet communication between the nodes and comprises: a memory configured to store designation information and part information, wherein the designation information designates search key information of a node and the search key information is used as a search key determining a transmission destination that is a relay destination when one of the one or more relay nodes receives a packet and wherein the part information indicates a packet part in which the search key information is included, wherein the control node is configured to, in a case in which a node is newly connected to at least one of the one or more relay nodes , acquire node information relating to the newly connected node , extract search key information of the newly connected node on the basis of the acquired node information and the designation information stored in the memory , and, in a case in which, in a packet received by at least one relay node among the one or more relay nodes , the search key information of the newly connected node is included in a packet part indicated by the part information, set a transmission destination of the packet for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission. a memory configured to store designation information and part information, wherein the designation information designates search key information of a node and the search key information is used as a search key determining a transmission destination that is a relay destination when one of the one or more relay nodes receives a packet and wherein the part information indicates a packet part in which the search key information is included, wherein the control node is configured to, in a case in which a node is newly connected to at least one of the one or more relay nodes , acquire node information relating to the newly connected node , extract search key information of the newly connected node on the basis of the acquired node information and the designation information stored in the memory , and, in a case in which, in a packet received by at least one relay node among the one or more relay nodes , the search key information of the newly connected node is included in a packet part indicated by the part information, set a transmission destination of the packet for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission. acquire node information relating to the newly connected node , extract search key information of the newly connected node on the basis of the acquired node information and the designation information stored in the memory , and, in a case in which, in a packet received by at least one relay node among the one or more relay nodes , the search key information of the newly connected node is included in a packet part indicated by the part information, set a transmission destination of the packet for at least a part of the one or more relay nodes or each of all the relay nodes in a transmission path of the packet transmission. <EOS>