PROBLEM TO BE SOLVED: To provide a method which can make a destructive attack difficult to a plurality of business processing programs using a common function F, so as to improve performance of defense against the destructive attack to the business processing program, and to provide a business processing program and a system to which the method is applied.;SOLUTION: As a feature, every stack structure of the function F which the plurality of business processing programs p1 to pN use in common is different in the programs p1 to pN. As a method for differentiating the stack structures, on compilation of the programs p1 to pN, the order in which a local variable of the function F is piled up on the stack is varied in the programs p1 to pN. Otherwise, for the stack, dummy areas are piled between the local variables, between the local variable and a return address, and between the return address and a dummy augment.;COPYRIGHT: (C)2004,JPO
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