Key unit, control system, control method, and non-transitory computer-readable storage medium having program stored therein

A key unit comprising:

• a first communication module configured to perform radio communication with a user device using a first communication standard;
• a second communication module configured to perform radio communication with a control device mounted in a vehicle or a facility using a second communication standard which is different from the first communication standard;
• an authentication unit configured to perform authentication using authentication information when an operation request including the authentication information has been received from the user device via the first communication module;
• and
• a control unit configured to perform locking and unlocking of the vehicle or the facility with a key in response to the operation request when the authentication using the authentication information has succeeded and to transmit a control signal for performing an operation other than the locking and unlocking with the key to the control device via the second communication module after the authentication.