Dash cam having anti-theft function and anti-theft system for dash cam

A dash cam with an anti-theft function, the dash cam comprising:

• an image acquisition unit configured to capture an image;
• a housing, in which the image acquisition unit is built in, mounted inside a vehicle so that the image acquisition unit images a space including at least a portion of a part constituting the vehicle;
• an image storage unit configured to store a first image and a second image captured by the image acquisition unit;
• an image analysis unit configured to compare the first image with the second image and determine whether the vehicle in which the housing is mounted has been changed;
• and
• a theft signal output unit configured to output a preset theft occurrence signal based on a determination that the vehicle has been changed by the image analysis unit,
• wherein the image analysis unit is configured to determine whether the vehicle has been changed by comparing a reference region in which the part appears in the first image and a comparison region corresponding to the reference region in the second image.