To easily and securely confirm whether a paper sheet is appropriate for the use in an image forming device when supplying the paper sheets to various image forming devices having a different image forming method from each other.

When supplying the paper sheets to the image forming device 1A, a pictorial symbol showing the image forming method and marked on a wrapping sheet enclosing the paper sheets and a pictorial symbol 4a showing the image forming method of the image forming device 1A and marked in an outer part 5 of the image forming device 1A, to which the paper sheets are to be supplied, are compared with each other. After confirming that the paper sheets is appropriate to be used for the image forming device 1A, the paper sheets are supplied, and the wrong operation of supplying inappropriate paper sheets for the image forming method of the image forming device 1A is prevented.