Problem to be solved: to provide a method of detecting an illegal device for facilitating the detection of illegal labor between foreign workers and the receiving company, a foreign employment system, a program, and a method of detecting illegal labor for foreign workers.In the foreign work support system 1Fault detection apparatus 100 includesInformation for identifying results in the aggregate periodInformation specifying the amount of salary paid to a foreign workerA storage part 130 storing theThe amount of money to be paid from an individual account of a foreign workerIf the result of the salary contribution to the result is lower than the first reference value, the worker shortage decision unit 113 determines the lack of labor forceBy using a personal account of an individual's foreign workerThe sum of the decrease in the amount of money in the shortage of labor shortage from the amount of money which is not in the state of shortage of laborThe lack of labor force from the level of correlation with the amount of consideration in proportion to the shortage of laborOr, an invalid detector 117 for outputting an unauthorized provision.Diagram
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