A data terminal apparatus includes a communications mechanism, a detector, a register, and a controller. The communications mechanism performs electronic communications with a manager supervising the apparatus. The detector detects a status of usage of a consumable product used in the apparatus and supplied by a service depot. The register registers electronic communications addresses of the manager and the service depot, identification of the apparatus, specification of the consumable product, and identification of the service depot. The controller sends a request for supplying the consumable product to the manager when the detector detects that the consumable product is nearly ended. The request includes the identification of the apparatus, the specification of the consumable product, and the identification of the service depot. Further, the controller sends a report for reporting a completion of supplying the consumable product on the apparatus when the detector detects that the consumable product is refilled.