A storage battery monitoring method receives identification information indicating a storage battery system and characteristic data of a storage battery, the characteristic data including history information which indicates charging and discharging history of the storage battery; determines, based on the received history information, a deterioration model corresponding to the storage battery from among deterioration models managed in a database, the deterioration models each indicating a relationship between a state of health and a number of charging and discharging cycles performed by the battery as indicated by the charging and discharging history; generates control data for suppressing deterioration of the storage battery at a predetermined point in time according to the corresponding deterioration model; and transmits the generated control data to cause the storage battery system to control the storage battery.