The present invention provides a monitoring method for infectious diseases. The monitoring method includes: obtaining disease information from a plurality of medical facilities 131, 132, 133, and 134; determining the disease occurrence status for each medical facility based on the disease information and a first criterion related to the disease occurrence status at the medical facility; and generating first area alarm information related to the infectious disease status in a first zone based on the disease occurrence status in the medical facilities associated with the first zone divided by a first area division, and a second criterion related to the disease occurrence status in the first zone.