According to any improvement under support system which an input unit, a display, a rake processing unit and a memory unit comprises a, stores the analysis data storage unit, which contain analytic information also, the "phenomenon" or "effect " and" cause "or" means "corresponds to, for each of the fault modes, the previously in the stage of the product design or process design have been pulled out, as well as error function production history data, in which error function information, the faulty function based on the contents of which is formed to the error mode of the analytic information also in relationship is set, is accumulated sequentially each time when the malfunction is detected, after the system is started. The rakes a processing unit has a function of the retrieval of the analysis data using the error function information as a key and determining the fault mode is correlated to the malfunction. The number of malfunction, the to the analytic information also, relating to one each error mode, are set in relationship, is counted, and the total number of malfunction, the with the fault mode is set in relation to one another, with the contents of the fault mode is displayed in the display.
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