PURPOSE: To prevent mixture of printed boards of different conditions and to eliminate confirmation of a quantity, processing conditions by substituting information such as a board size, processing conditions, etc., for a color pattern and identifying in a step of supplying the board to a processor.

CONSTITUTION: A printed board 1 in which a color pattern 2 for substituting information such as various board sizes, processing conditions, etc., for the pattern 2 having a plurality of colors combined and aligned regularly at arbitrary positions of the board 1, and the pattern 2 arranged on the board 1 are identified by a camera 7 for identifying the pattern 2 and a picture processor 8, the information such as the various board sizes, the processing conditions, etc., previously set by the pattern is collated, and the board 1 and the information are supplied to a processor.