A cognitive radio system includes cognitive radio apparatuses and a management server via a network. The cognitive radio apparatus includes a terminal communication part selecting a communication protocol, a communication quality acquisition part acquiring a communication quality including a current location of the selected protocol, and a communication quality notification part notifying the server of the information. The server includes a server communication part communicating with the apparatus, a communication quality collecting part collecting the information, a communication quality managing part recording and managing the information, and an area communication condition providing part providing the information to the apparatus.