Liquid ejection controlling method and liquid ejection apparatus

A liquid ejection controlling method comprising:

• (A) a remaining amount detecting step of detecting a remaining amount of a liquid contained for each of a plurality of cartridges containing the liquid to be ejected from nozzles, the remaining amount detecting step being performed by a first controller;
• (B) an information transmitting step of transmitting information relating to a cartridge with a small remaining amount, when the remaining amount of the liquid in at least one of the cartridges is detected to be equal to or lower than a predetermined amount, the cartridge with the small remaining amount corresponding to the at least one of the cartridges, the information transmitting step being performed by the first controller;
• (C) a liquid ejection data generating step of generating and transmitting liquid ejection data for controlling ejection of a liquid contained in a substitute cartridge, by determining at least one cartridge other than the cartridge with the small remaining amount as the substitute cartridge based on the information, relating to the cartridge with the small remaining amount, that has been transmitted, the liquid ejection data generating step being performed by a second controller;
• and
• (D) a remaining amount information obtaining step of obtaining information relating to a remaining amount of the liquid of the substitute cartridge from the first controller each time a process of transmitting the liquid ejection data is performed, after the information relating to the cartridge with the small remaining amount has been received, the remaining amount information obtaining step being performed by the second controller.