1. A diagnosis support apparatus which supports diagnosis based on information associated with a diagnosis name in advance, the apparatus comprising: an acquisition unit configured to acquire information set by a user and a diagnosis name set by the user; an inference unit configured to obtain a diagnosis name as an inference result based on information set by the user, and obtain negative information for the inference result identical to the diagnosis name set by the user; and a providing unit configured to provide the negative information for the diagnosis name set by the user based on the information.