A pathological diagnosis support apparatus which outputs a diagnostic region that is to be used as a target for diagnosis in a specimen image representing a specimen that is a target for pathological diagnosis, and includes: a target obtainment unit which obtains the specimen image and specimen information related to a scheme for preparing the specimen a criterion obtainment unit which obtains a criterion corresponding to the specimen information from a database associating, for each of specimens, specimen information related to a scheme for preparing the specimen with a criterion indicating a condition of a positive rate which is to be satisfied by the diagnostic region in a specimen image and an output unit which outputs, as the diagnostic region, each of one or more regions in the specimen image having the positive rate determined to satisfy a condition indicated by the criterion obtained by the criterion obtainment unit.
