Patent ID: 8650099

Claim:
A method in a management system configured to manage stock of a consumable used in an image formation apparatus, the method including: acquiring, using a processor, a plurality of residual amount notifications in accordance with a residual amount of a specified recording material in the consumable disposed in the image formation apparatus; deciding, by the processor, a counter value used in a determination of stock subtraction for the consumable using a first counter value and a second counter value upon acquiring each of the residual amount notifications, a first counter value being notified together with each of the acquired residual amount notifications and indicating a sheet number of images formed by using the recording material in the image formation apparatus in a first mode, and a second counter value being notified together with each of the acquired residual amount notifications and indicating a sheet number of images formed in a second mode using a more amount of the recording material than in the first mode using the recording material in the image formation apparatus; determining, using the processor, whether a difference of the decided counter value upon acquisition of a previous residual amount notification of the acquired plurality of residual amount notifications and the decided counter value upon acquisition of a current residual amount notification of the acquired plurality of residual amount notifications is greater than or equal to a predetermined value; and performing, using the processor, stock subtraction processing on the consumable when the determining step determines that the difference is greater than or equal to the predetermined value, wherein in the deciding step, for each of the residual amount notifications: a value calculated by multiplying a first parameter by the first counter value notified together with the residual amount notification is added to a value calculated by multiplying a second parameter by the second counter value notified together with the residual amount notification and, the value obtained by the addition is decided as the counter value used in determination of the stock subtraction.