An information processing system comprising a plurality of nodes mutually coupled via a plurality of cables and an information processing apparatus coupled with the plurality of nodes for controlling the plurality of nodes, wherein each of the plurality of nodes has a function that, based on a difference between coordinate information of a destination node included in information received through a cable of the plurality of cables and coordinate information of its node, determines a directional dimension to transfer the received information and transfers the received information to the cable associated with the determined directional dimension, the apparatus comprising: a memory; a processor coupled to the memory, the processor being configured to extract coupling relationship between the plurality of nodes, based on information on the neighboring nodes identified for each of the nodes, by executing a first processing of a first node of the plurality of nodes allocated sequentially as each one of the plurality of nodes, the first processing including: executing allocation processing that allocates unique coordinate information to the first node and allocates common coordinate information to nodes excluding the first node, wherein the unique coordinate information and the common coordinate information are different by "1" at one of a plurality of directional dimensions; executing transmission processing that causes the first node to transmit first information to each of the cables coupled to the first node; and executing identification processing that identifies a node having received the first information as a neighboring node coupled to one of the plurality of cables coupled to the first node, wherein each of the plurality of nodes has a registration unit with which the information processing apparatus registers a relationship between a cable and an associated directional dimension, and wherein the information processing apparatus sequentially changes, in the registration unit, the cable associated with the directional dimension different by "1", and causes the cable associated with the directional dimension different by "1" to transmit first information. a memory; a processor coupled to the memory, the processor being configured to extract coupling relationship between the plurality of nodes, based on information on the neighboring nodes identified for each of the nodes, by executing a first processing of a first node of the plurality of nodes allocated sequentially as each one of the plurality of nodes, the first processing including: executing allocation processing that allocates unique coordinate information to the first node and allocates common coordinate information to nodes excluding the first node, wherein the unique coordinate information and the common coordinate information are different by "1" at one of a plurality of directional dimensions; executing transmission processing that causes the first node to transmit first information to each of the cables coupled to the first node; and executing identification processing that identifies a node having received the first information as a neighboring node coupled to one of the plurality of cables coupled to the first node, executing allocation processing that allocates unique coordinate information to the first node and allocates common coordinate information to nodes excluding the first node, wherein the unique coordinate information and the common coordinate information are different by "1" at one of a plurality of directional dimensions; executing transmission processing that causes the first node to transmit first information to each of the cables coupled to the first node; and executing identification processing that identifies a node having received the first information as a neighboring node coupled to one of the plurality of cables coupled to the first node, wherein each of the plurality of nodes has a registration unit with which the information processing apparatus registers a relationship between a cable and an associated directional dimension, and wherein the information processing apparatus sequentially changes, in the registration unit, the cable associated with the directional dimension different by "1", and causes the cable associated with the directional dimension different by "1" to transmit first information.