Abstract: A medical diagnosis system includes an input such as a floppy disk drive or a keyboard for inputting data of test items obtained by doctor's consultation, physical examination, and/or test. A microprocessor unit (1) compares the input data with evaluation ranges to determine into which evaluation range the input data falls, (2) compares the evaluation range with condition groups each including one or more condition formulae, thereby generating an evaluation result of sickness or disorder, and (3) provides data of sickness or disorder including type, level, causes, and comments if the condition groups are satisfied, thereby preparing a list of evaluation results. In the event different evaluation results are obtained with respect to a sickness or disorder, the most serious evaluation result for such sickness or disorder is added to the list of evaluation results. An output such as a printer, floppy disk drive, or display monitor displays the evaluation results list in a sentence format.