A system is mounted on a vehicle and includes a sensor configured to perform a detection process that detects a fingerprint of a finger touching the sensor in order to perform a fingerprint authentication process, and a controller. The controller is configured to: (i) control a power supply of the vehicle to be ON when a predetermined authentication process through a predetermined communication with another device other than the sensor is successful, the predetermined authentication process being different from the fingerprint authentication process, and (ii) suppress the detection process that detects the fingerprint in response to the power supply of the vehicle being ON and the predetermined authentication process being successful.