A health condition determining device accumulates data measured or input by an evaluation subject for each index of a plurality of items including a lifestyle index, which is an index related to body activity or lifestyle habit, and a biomarker, which is an index related to physiological state of the body. The health condition determining device then selects one or a plurality of biomarkers that lowers the evaluation of the health condition of the evaluation subject as a problematic index, extracts one or a plurality of lifestyle indices having the highest correlation with the problematic index as an improvable factor by comparing accumulated past data of the lifestyle index and the biomarker, and displays the improvable factor along with the evaluation of the health condition of the evaluation subject.