Abstract: An apparatus acquires, from a patient information storage device that stores patient information including a symptom of each of a plurality of patients and a medical history of each of the plurality of patients, the patient information of each of the plurality of patients. The apparatus extracts first patient information including a symptom of a target patient from the patient information of each of the plurality of patients, estimates a first disease corresponding to the symptom of the target patient based on a medical history included in the first patient information. The apparatus searches for first medical institution information including the first disease, from medical institution information including identification information indicating each of a plurality of medical institutions and a disease that has been treated at each of the plurality of medical institutions, and outputs first identification information included in the first medical institution information including the first disease.