1. A diagnosis support apparatus comprising: an inference unit configured to, based on a plurality of pieces of medical information, calculate an inference probability with respect to plural candidates of diagnosis name concerning medical diagnosis; a calculation unit configured to calculate, for a plurality of partial sets, each including, as an element, at least one piece of medical information retrieved from the plurality of pieces of medical information, a degree of effect on a respective inference probability of at least one of the plural candidates of diagnosis name, the calculation unit being configured to calculate the degree of effect individually for the at least one of the plural candidates of diagnosis name; and a display control unit configured to cause a display unit to display, as an inference result, the at least one of the plural candidates of diagnosis name, wherein the at least one of the plural candidates is specified based on the inference probability calculated by the inference unit, and to cause the display unit to display medical information included in a partial set of information retrieved from the plurality of pieces of medical information, wherein the partial set including the displayed medical information is retrieved from the plurality of pieces of medical information, based on the degree of effect calculated by the calculation unit based on the inference result.