A test assistance device includes a memory that stores a program and a processor that executes the program. The processor, by executing the program, selects, based on a first attribute included in a test case group of system software, a target test case that is a test execution target from the test case group, determines, based on a second attribute included in the selected target test case, whether the target test case is a test case for automatic test, and classifies the target test cases into the target test case for automatic test and the target test case for manual test.