A hearing aid fitting management system comprises a fitting device, a server, and a client device that are connectable to each other in a network. The server stores hearing ability data received from the client device as a hearing ability certificate, produces a prescription number corresponding to the hearing ability certificate, and sends the prescription number to the client device. The fitting device sends the server the prescription number that has been inputted. The server sends the fitting device the hearing ability certificate corresponding to the prescription number received from the fitting device. The fitting device sends the hearing ability certificate to a hearing aid, and limits the settings in the fitting of the hearing aid to within the range of the hearing ability data.
