1. 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, the pathological diagnosis support apparatus comprising: a target obtainment unit configured to obtain the specimen image and specimen information related to a scheme for preparing the specimen; a criterion obtainment unit configured to obtain, from a database, a criterion corresponding to the specimen information obtained by the target obtainment unit, the database associating, for each of specimens, specimen information related to a scheme for preparing the each of specimens with a criterion indicating a condition of a positive rate which is to be satisfied by a region that is a target for diagnosis in a specimen image representing the each of specimens; a determination unit configured to determine, based on the specimen image obtained by the target obtainment unit, whether or not a positive rate calculated for each of regions in the specimen image satisfies a condition indicated by the criterion obtained by the criterion obtainment unit; and an output unit configured to output, as the diagnostic region, each of one or more regions having the positive rate determined by the determination unit to satisfy the condition indicated by the criterion.