Patent ID: 8712257

Claim:
An image forming system comprising: a first generation unit, wherein for a monitoring item whose detection values, which were detected during an image forming operation in an image forming apparatus in which a trouble occurred within a predetermined time period after an operating condition of the image forming operation was changed, were changed from a normal state to an abnormal state after the operating condition was changed, the first generation unit generates characteristic information indicating a variation state of the detection values which were detected before the operating condition was changed; a setting unit that sets criterion information which is a criterion to predict occurrence of a trouble, based on the characteristic information generated by the first generation unit; a second generation unit that generates, for the monitoring item corresponding to the criterion information set by the setting unit, characteristic information indicating a variation state of detection values in an image forming apparatus of a prognosis target; and a prognosis unit that predicts as to whether or not a trouble occurs in the image forming apparatus of the prognosis target after the operating condition is changed in the image forming apparatus of the prognosis target, based on a difference between the criterion information set by the setting unit and the characteristic information generated by the second generation unit.