1. A method of supporting differentiation of an image of corneocytes using a computer, comprising steps of: registering, in a storage device of the computer, stained specimen group data including a plurality of enlarged images of stained specimens of corneocytes, and unstained specimen group data including a plurality of enlarged images of unstained specimens of corneocytes; reading the stained specimen group data and the unstained enlarged specimen group data from the storage device, and comparing both of the data, by a central processing unit of the computer; creating a conversion formula for an RGB value, based on a result of the comparison, by the central processing unit; reading, into the storage device, an image showing a state of corneocytes of skin, as an enlarged image picture, through image taking means connected to the computer; reading out the enlarged image picture and converting the RGB value for each pixel according to the conversion formula, by the central processing unit; and creating pseudocolor image data according to the converted RGB values, developing the pseudocolor image data on an image memory, and displaying the pseudocolor image data on a display device, by the central processing unit.