A communication system for performing multi-hop communication, the communication system comprising: a plurality of communication devices (502, 503, 504), each of which includes a first communication unit for performing first wireless communication by use of a directional radio wave and a second communication unit for performing second wireless communication by use of a radio wave of a larger communication range than the first wireless communication, the plurality of communication devices being configured to utilize the first wireless communication for performing the multi-hop communication with each other; and a central control device including the second communication unit for performing the second wireless communication, the central control device being configured to utilize the second wireless communication for managing a communication path of the multi-hop communication through which data is transferred, wherein the plurality of communication devices include a plurality of distributed control devices, each of which is configured to utilize the first wireless communication for forming a network cell to be coupled by at least one of the plurality of communication devices and for controlling the at least one of the plurality of communication devices to transfer the data via the first wireless communication, based on the communication path, and at least one relay device configured to become coupled to a network cell formed by one of the plurality of distributed control devices and configured to utilize the first wireless communication for receiving the data from the one of the plurality of distributed control devices and transferring the data to another one of the plurality of distributed control devices, the central control device utilizes the second wireless communication for controlling the plurality of distributed control devices located in the communication path to transfer the data, based on the communication path; characterized in that each of the communication devices is configured: (i) to detect whether the communication device is able to communicate via the first wireless communication with the central control device or one of the distributed control devices, (ii) if the detection is positive, to start operating as a coupled device in a network cell formed by the central control device or that distributed control device, and (iii) if the detection is negative, to start operating as a distributed control device and form a network cell for performing the first wireless communication. a plurality of communication devices (502, 503, 504), each of which includes a first communication unit for performing first wireless communication by use of a directional radio wave and a second communication unit for performing second wireless communication by use of a radio wave of a larger communication range than the first wireless communication, the plurality of communication devices being configured to utilize the first wireless communication for performing the multi-hop communication with each other; and a central control device including the second communication unit for performing the second wireless communication, the central control device being configured to utilize the second wireless communication for managing a communication path of the multi-hop communication through which data is transferred, wherein the plurality of communication devices include a plurality of distributed control devices, each of which is configured to utilize the first wireless communication for forming a network cell to be coupled by at least one of the plurality of communication devices and for controlling the at least one of the plurality of communication devices to transfer the data via the first wireless communication, based on the communication path, and at least one relay device configured to become coupled to a network cell formed by one of the plurality of distributed control devices and configured to utilize the first wireless communication for receiving the data from the one of the plurality of distributed control devices and transferring the data to another one of the plurality of distributed control devices, a plurality of distributed control devices, each of which is configured to utilize the first wireless communication for forming a network cell to be coupled by at least one of the plurality of communication devices and for controlling the at least one of the plurality of communication devices to transfer the data via the first wireless communication, based on the communication path, and at least one relay device configured to become coupled to a network cell formed by one of the plurality of distributed control devices and configured to utilize the first wireless communication for receiving the data from the one of the plurality of distributed control devices and transferring the data to another one of the plurality of distributed control devices, the central control device utilizes the second wireless communication for controlling the plurality of distributed control devices located in the communication path to transfer the data, based on the communication path; characterized in that (i) to detect whether the communication device is able to communicate via the first wireless communication with the central control device or one of the distributed control devices, (ii) if the detection is positive, to start operating as a coupled device in a network cell formed by the central control device or that distributed control device, and (iii) if the detection is negative, to start operating as a distributed control device and form a network cell for performing the first wireless communication.