To make forgery or alteration difficult to apply for an individual recognizing medium with a face photograph image of an owner of ID card such as an employee certificate, a passport and the like.

A face photograph image 1 with recognizing patterns 2 is formed as an image for printing by recognizing patterns 2 such as figures, characters, stamps and the like and the face photograph image 1, and the image for printing is printed to form an individual recognizing medium 10 having a face photograph image 1 with recognizing patterns 2. When the image for printing is formed, a gradation mask image 4, in which density is varied as the face photograph image 1 is formed starting from a face section toward peripheral sections, is used combinedly and the face section of the face photograph image 1 is formed as an image data for printing without recognizing patterns 2 or with color-lightened recognizing patterns to prevent the overlapping of the recognizing patterns 2 on the face section from being hard to see.