Press system and control method for press system

A press system comprising:

• a press device configured to perform press working on a workpiece;
• a detection device configured to detect a press load applied for the press working by the press device;
• a number acquisition device configured to acquire a number of cycles of press loading, for each section of a plurality of sections into which a press loading region over a total length of a slide stroke is divided, wherein the press loading region is divided into the plurality of sections at predetermined length intervals of the slide stroke;
• a stress calculation device configured to calculate a stress applied to the press device, the stress corresponding to the press load for each section of the press loading region;
• and
• a degree-of-fatigue calculation device configured to calculate a degree of fatigue of the press device, based on respective stresses applied to the press device and respective numbers of cycles of press loading, for the plurality of sections of the press loading region.