On a printing relief plate (C1, C2), which is produced by a printing relief plate producing apparatus (10A, 10B) and a printing relief plate producing method, convexities (76a to 76c) and detecting portions (74, 74a, 74b) are set to be lower than a solid area (72) of the printing relief plate (C1, C2). In the event that a detecting portion image and a solid area image are printed on a print medium (32) using the printing relief plate (C1, C2) by a printing apparatus (20A, 20B) and by carrying out a printing method, in a printing pressure determining apparatus (39A, 39B) and a printing pressure determining method, it is determined whether a printing pressure is an appropriate printing pressure or not by comparing an optical density of the detecting portion image and an optical density of the solid area image.
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