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.