21. The diagnosis support apparatus according to claim 18 , wherein the calculation unit calculates the degree of effect for each candidate of the plural candidates of diagnosis name, whose posteriori probability calculated by the inference unit exceeds a predetermined value.
18. The diagnosis support apparatus according to claim 15 , wherein the inference unit calculates, for each of the plural candidates of diagnosis name to which a priori probability are set, an inference probability of each of the plural candidates of diagnosis name by calculating a posteriori probability based on the plurality of pieces of medical information.