| 摘要 |
A remaining amount of liquid contained in each of a plurality of cartridges is detected. When a small remaining amount is detected, information relating to the cartridge with the small remaining amount is transmitted. A substitute cartridge is determined based on the transmitted information, and liquid ejection data for the substitute cartridge is generated. An expected consumption amount of liquid contained in the substitute cartridge is calculated based on the liquid ejection data. A difference between the remaining amounts of liquid in the cartridge with the small remaining amount and in the substitute cartridge is calculated based on the expected consumption amount and information relating to the remaining amount of liquid. It is determined whether the calculated difference is equal to or lower than a predetermined value.
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