A verification method comprising: acquiring an image feature of a component in a product to be verified; and verifying input product information of the product to be verified with product information stored in a storage unit on a producer side, the product information comprising product identification information, on a basis of the acquired image feature of the component and an image feature stored in the storage unit on a supplier side, wherein the image feature of the component stored in the storage unit is a random pattern in a predetermined area that can be identified in units of individuals by using a processing method in which the image feature of the component is a random pattern which has been generated on the surface of the component during the component's fabrication and is stored in association with the product information stored in the storage unit, wherein the image feature of the component in the storage unit on the supplier side of the component is associated with identification information of the component, and wherein the product information in the storage unit on the producer side is associated with the identification information of the component; and wherein, for verification, the identification information about the component is acquired from the storage unit on the supplier side of the component on a basis of the acquired image feature, and the product information is acquired from the storage unit on the producer side of the product on a basis of the acquired identification information about the component such that the product identification information is kept secret from the supplier and the image feature of the component is only stored in the storage unit on the supplier side. acquiring an image feature of a component in a product to be verified; and verifying input product information of the product to be verified with product information stored in a storage unit on a producer side, the product information comprising product identification information, on a basis of the acquired image feature of the component and an image feature stored in the storage unit on a supplier side, wherein the image feature of the component stored in the storage unit is a random pattern in a predetermined area that can be identified in units of individuals by using a processing method in which the image feature of the component is a random pattern which has been generated on the surface of the component during the component's fabrication and is stored in association with the product information stored in the storage unit, wherein the image feature of the component in the storage unit on the supplier side of the component is associated with identification information of the component, and wherein the product information in the storage unit on the producer side is associated with the identification information of the component; and wherein, for verification, the identification information about the component is acquired from the storage unit on the supplier side of the component on a basis of the acquired image feature, and the product information is acquired from the storage unit on the producer side of the product on a basis of the acquired identification information about the component such that the product identification information is kept secret from the supplier and the image feature of the component is only stored in the storage unit on the supplier side.