14. A medical decision making support apparatus comprising: an inference unit configured to obtain an inference result by performing inference processing associated with a medical diagnosis based on a plurality of elements of input medical information; a calculation unit configured to calculate a degree of effect, on the inference result, in association with at least one item of the input medical information that affects an inference probability for the inference result; a selection unit configured to select at least one item of the input medical information which reduces and/or increases the inference probability for the inference result; and a presentation unit configured to present the at least one item of the input medical information, selected by the selection unit, as negative and/or affirmative information, wherein the calculation unit is configured to calculate the degree of effect in association with each of a plurality of partial sets, as the item, of the plurality of elements of the input medical information.
15. The apparatus according to claim 14 , wherein the presentation unit presents medical information included in a partial set for which a highest degree of denial is calculated by the calculation unit and medical information included in a partial set for which a highest degree of affirmation is calculated, as the negative information and the affirmative information, respectively.