A determination system comprising: an imaging data acquisition device that captures an image of a printed surface of a printed product to acquire imaging data of the captured image; and a determination device that determines, based on the imaging data acquired by the imaging data acquisition device, a printing method used to produce the printed surface of the printed product for which the image is captured by the imaging data acquisition device, wherein the determination device selects a determination area included in the captured image from the imaging data acquired by the imaging data acquisition device, wherein, the determination device further extracts a determination end image from an edge portion around an end portion of a black determination image included in the selected determination area, acquires difference data, the difference data being a difference in gradation between two colors among gradation data of RBG colors of the extracted determination end image, acquires, based on the acquired difference data, a determination value for determining a printing method used to produce the printed surface of the printed product, and determines, based on the acquired determination value, a printing method used to produce the printed surface of the printed product, wherein the determination device determines, based on the acquired determination value, - whether the printed product is a printed product in which the black determination image is printed in black ink from a plate or a printed product in which the black determination image is printed in multiple colors superimposed on each other by a printing method using a printer, or, - whether the printed product is a printed product printed by a printing method using a plate or a printed product printed by a printing method using a printer that performs printing through scanning using a driving system. an imaging data acquisition device that captures an image of a printed surface of a printed product to acquire imaging data of the captured image; and a determination device that determines, based on the imaging data acquired by the imaging data acquisition device, a printing method used to produce the printed surface of the printed product for which the image is captured by the imaging data acquisition device, wherein the determination device selects a determination area included in the captured image from the imaging data acquired by the imaging data acquisition device, wherein, the determination device further extracts a determination end image from an edge portion around an end portion of a black determination image included in the selected determination area, acquires difference data, the difference data being a difference in gradation between two colors among gradation data of RBG colors of the extracted determination end image, acquires, based on the acquired difference data, a determination value for determining a printing method used to produce the printed surface of the printed product, and determines, based on the acquired determination value, a printing method used to produce the printed surface of the printed product, wherein the determination device determines, based on the acquired determination value, - whether the printed product is a printed product in which the black determination image is printed in black ink from a plate or a printed product in which the black determination image is printed in multiple colors superimposed on each other by a printing method using a printer, or, - whether the printed product is a printed product printed by a printing method using a plate or a printed product printed by a printing method using a printer that performs printing through scanning using a driving system. - whether the printed product is a printed product in which the black determination image is printed in black ink from a plate or a printed product in which the black determination image is printed in multiple colors superimposed on each other by a printing method using a printer, or, - whether the printed product is a printed product printed by a printing method using a plate or a printed product printed by a printing method using a printer that performs printing through scanning using a driving system.