In an exemplary embodiment of the disclosure, the vehicle information and the standard vehicle information include a license plate number, a color and a vehicle type. The second identifier 3 is configured to send the first identification command to the first identifier 2 when at least one of the color and the vehicle type of the vehicle information contained in the vehicle image is not consistent with the corresponding at least one of the color and the vehicle type in the standard vehicle information of the same license plate number in the vehicle information base, so that the first identifier 2 determines whether the license plate number is tampered.

That is, the second identifier 3 first matches the vehicle information contained in a captured image of a current vehicle to the vehicle information of the same license plate number stored in a history record. When the two are not consistent, it means that the vehicle information is problematic and the license plate of the vehicle is very probable to be a tampered plate. Then, the first identifier 2 further determines whether the license plate number is tampered. When the vehicle information contained in the captured image of the current vehicle is consistent with the vehicle information of the same license plate number stored in the history record, it means that the license plate of the vehicle is less likely to be a tampered plate, and there may be no need to further determine whether it is a tampered license plate. It should be noted that in order to further improve the reliability, even if the vehicle information contained in the captured image of the current vehicle is consistent with the vehicle information of the same license plate number stored in the history record, the first identifier 2 may further be used to determine whether the license plate number is tampered.