COMMUNICATION DEVICE, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM

A communication device (100) includes a communication unit (110) and a control unit (150). The communication unit (110) performs wireless communication using at least one of a plurality of beams. The control unit (150) acquires service communication quality corresponding to quality requested on a service. The control unit (150) obtains, by estimation, an estimated communication quality achievable by the communication unit (110), based on a radio wave propagation environment. Even in a case where a beam quality of a non-currently working beam, a beam which is not being used for wireless communication, is higher than the beam quality of a currently working beam, which is being used for wireless communication, the control unit (150) maintains the communication by the currently working beam in a case where the estimated communication quality is the service communication quality or more. In a case where the estimated communication quality is below the service communication quality, the control unit (150) determines switching of the beam.