The influence extraction device includes an output result acquisition unit, a change extraction unit and a search unit. The output result acquisition unit acquires a first output result of a subsystem before a change in a program, and a second output result of the subsystem after the change in the program. The change extraction unit compares the first output result and the second output result, and extracts an interface item whose item value is changed from a plurality of interface items that the subsystem includes. The search unit searches subsystem information for another subsystem including an interface item related to the interface item extracted.
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