1. An image capturing method comprising: irradiating plurality of infrared beams onto an object, each of the plurality of the infrared beams having different wavelength intensity distributions each other, the object having an attaching component that reflects a first infrared beam among the plurality of the infrared beams, capturing an image of the object using each of a plurality of reflected infrared beams having different wavelength intensity distributions, each of the plurality of the reflected infrared beams being reflected by the object and forming image data which represent a plurality of images for the each of the plurality of the reflected infrared beams, and setting color data for coloring each of the plurality of the images represented by the image data by using different mono-colors, wherein when the image data is denoted by |C>, the following equations hold; 
 | C>=H|I>, 
 | C >=( R,G,B ), 
 | I> T =( I 1 ( x,y ), I 2 ( x,y ), I 3 ( x,y ),. .. , I n ( x,y )) wherein n is an integer, each of I 1 (x, y), I 2 (x, y), I 3 (x, y),. .. , and I n (x, y) is the image data representing the each of the plurality of the images captured by the capturing part, (x, y) is a position in the each of the plurality of the images, H denotes the color data expressed in a matrix of three rows and n columns, and R, G, and B respectively denote luminosity of “R”, “G”, and “B” components in three primary colors, I 1 (x, y) is captured using the first infrared beam among the plurality of the reflected infrared beams, and H is selected so that one or two of R, G, and B depends on I 1 (x, y).