A communication apparatus includes a user signal transmission unit that transmits a user signal required for an end user to perform communication; a manager function implementing unit that implements a function provided to a manager of the present apparatus; a license monitoring unit that monitors a license of the present apparatus, and outputs a function limitation signal when the license has expired; and a function limitation unit that limits the function implemented by the manager function implementing unit when receiving the function limitation signal. In a communication apparatus that transmits a user signal required for an end user to perform communication, a function of the apparatus is limited when a relevant license has expired, while preventing an influence of the limitation upon the end user.