A second image analysis portion performs image analysis on a target image so as to extract an extracted lesion which is a lesion present in the target image, specifies the type thereof, and outputs an extraction result to a comparison portion. An information management portion reads a registered lesion corresponding to a disease name specified by a doctor from registered lesion information, and outputs the registered lesion to the comparison portion. The comparison portion compares the type of extracted lesion with the type of registered lesion, and outputs a comparison result to a screen output control portion. The screen output control portion outputs information display screen including reliability information indicating the reliability of the disease name specified by the doctor on the basis of a comparison result.
