PROBLEM TO BE SOLVED: To prepare a test specification in which deterioration of legibility is suppressed.SOLUTION: A test specification preparation program 330a makes a computer 300 execute the following processing. The computer 300 is made to execute: processing for calculating distance showing a degree of difference between a first test case included in a set of test cases and test cases except the first test case; processing for extracting a first set which is a set of test cases in which distance with the first test case becomes a predetermined value or more from the set of test cases; processing for extracting a second test case which becomes a representative from the first set; processing for extracting first difference between the first test case and test cases which are not included in the first set in the set of test cases in the set of test cases, and extracting second difference between the second test case and test cases except the second test case which are included in the first set; and processing for preparing a test specification in which the first difference and the second difference are described.
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