PROBLEM TO BE SOLVED: To enable a user to easily and accurately discriminate the reliability of a result of inference derived from medical decision-making assist.SOLUTION: A medical decision-making assist system performs inference processing concerning medical diagnosis on the basis of plural pieces of inputted medical information, and performs calculation processing of calculating a degree, to which a result of inference is affected negatively or positively, for each of plural subsets having as elements pieces of medical information fetched from the plural pieces of medical information. The medical decision-making assist system provides a user with the result of inference, which is obtained through the inference processing, and negative information that is medical information contained in a subset, for which the degree to which the result of inference is affected negatively is calculated through the calculation processing, out of the plural subsets.SELECTED DRAWING: Figure 2
