To carry out color matching in practical printing and establishing adjustment of an ink feed amount simply in a short time.

As establishing adjustment of the ink feed amount, adjustment of a correction amount (a constant value) of an opening amount of each color ink fountain duct key (a constant value) and a correction amount of a feed amount of an ink duct roller (a coefficient of an ink feed amount). The correction amount of the opening amount of each color ink fountain duct is stored in a memory 27, and a correction amount of the feed amount of each color ink duct roller is stored in a memory 30. Adjustment of each color ink fountain key opening amount to a correction amount of the ink fountain roller of each color is carried out. When printing is started, a standard opening amount of each ink duct key of each color is obtained from [a conversion curve of a pattern space factor to ink duct key opening amount] of each color, and is corrected by a correction amount after the adjustment. Further, a standard ink feed amount of each color is read from a memory 26 and corrected by a correcting amount of the ink fountain duct roller of each color in the memory 30.