A communication resource assignment system may include a communication resource assignment tool that includes a communication resource assignment algorithm that receives previously acquired user information, and outputs resource assignment information calculated by the communication resource assignment algorithm, a resource assignment state managing unit that receives and stores the resource assignment information output from the communication resource assignment tool, and a communication resource distributing unit that accesses the resource assignment state managing unit, reads the resource assignment information, and transmits the read resource assignment information to a management target device that has output a communication resource request among a plurality of management target devices that perform communication with each other via a network.