A function management system includes: an information collection unit configured to collect failure information including information about a failure of an electronic controller loaded in the vehicle and/or information about a failure of an instrument controlled by the electronic controller; and a determination unit configured to determine whether or not execution preparation for utilization start is possible for each of the option functions, and the determination unit determines that the execution preparation of the option function is impossible when a failure has been found in the electronic controller or the instrument required for execution of the option function, for each of the option functions, based on the failure information.