Refrigerant amount management system

A refrigerant amount management system for managing an amount of refrigerant with which each of a plurality of refrigeration cycle apparatuses is filled, each refrigeration cycle apparatus having a refrigerant circuit, the refrigerant amount management system comprising:

• an additional-filling-amount obtaining unit configured to obtain an additional filling amount, the additional filling amount being an amount of refrigerant with which a refrigeration cycle apparatus of the plurality of refrigeration cycle apparatuses has been additionally filled after installation;
• a storage unit configured to store
• apparatus information regarding the refrigeration cycle apparatus that has been additionally filled with refrigerant and
• the additional filling amount of the refrigeration cycle apparatus identified with the apparatus information
• in association with each other;
• and
• a useful-information creation unit configured to create useful information to be used in management of the amount of refrigerant based on the additional filling amount of one of the refrigeration cycle apparatuses and the additional filling amount of another of the refrigeration cycle apparatuses.