obtaining, by the at least one processor, image data for fluorescence generated from a target product and a quantum dot layer located in one region of the target product by laser light;

determining, by the at least one processor, a relative height and a relative distance between target quantum dots constituting the quantum dot layer by using the image data for the fluorescence, and generating a quantum dot arrangement map; and

determining, by the at least one processor, whether the target product is genuine by comparing the quantum dot arrangement map with a previously stored reference quantum dot arrangement map,

wherein the image data for the fluorescence includes three-dimensional (3D) spatial image data including three-dimensional images of the fluorescence generated from the target product and the quantum dot layer; and two-dimensional (2D) plane image data including a 2D image for the fluorescence generated from the quantum dot layer.