PURPOSE: To facilitate the operating process for adhesion by putting the outline of an original drawing on the folding line forming the outline of the folded drawing.

CONSTITUTION: A fold is so given folded that the folding direction indicated by the positions of a straight line group 8 of a 1st kind and a straight line group 9 of a 2nd kind is different from the folding direction that the position of a straight line group 11 of a 3rd kind. Then the drawing is folded along the fold so that arbitrary representative points on a 1st beltlike curve 1 are put over corresponding points, obtained by moving the representative points in parallel, on the reverse side of the drawing. Therefore, the 1st curve 1 is put over a 2nd curve 2. In this case, the drawing is loosely wound like plural straight lines 13 are bundled, compressed along the straight lines 13 while twisted, and folded along all the folds at the same time simultaneously, so that pairs of two corresponding points can easily be put one over the other on the reverse side of the drawing. Respective fulcra of the 1st and 2nd straight lines are put one over the other by the straight lines 13 and the folding is completed. Consequently, the adhering operation is made easy.