PROBLEM TO BE SOLVED: To easily identify a command to specific software.SOLUTION: An instruction history analysis program ANS allows a computer to execute: processing 31 for acquiring the instruction history of an executed instruction; processing 32 for acquiring a file history indicating the history of processing to a file; processing 36 for, on the basis of the content of the executed instruction, extracting an instruction to specific software, that is, a specific instruction excluding a general-purpose command and a common work command from the instruction history, and for, on the basis of the time information of the specific instruction included in the instruction history of the extracted specific instruction and the time information included in the file history, storing the extracted specific instruction and the file history corresponding to the specific instruction in association; processing 38 for selecting a feature word from a character string indicating the storage position of the file included in the file history stored in association with the extracted specific instruction; and processing 39 for storing the extracted specific instruction and the selected feature word in association with each other.SELECTED DRAWING: Figure 5
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