Patent ID: 8547567

Claim:
An image formation apparatus having a plurality of function units, comprising: a first power management unit configured to perform power management for supplying power for each of said function units; a plurality of components under the power management, provided in each said function unit and each supplied with power to implement a corresponding function; and a second power management unit provided for each said function unit and managing supplying power for each of said components, wherein said second power management unit is configured to: determine whether each said component has an operational status satisfying a first predetermined condition, wherein said first predetermined condition is whether how frequently said component is used is equal to or smaller than a predetermined value or not, stop supplying power to said component satisfying said first predetermined condition, if said component satisfies said first predetermined condition, determine whether said plurality of components have a power supply status satisfying a second predetermined condition, wherein said second predetermined condition is whether how many of said components is/are supplied with power is equal to or smaller than a predetermined value or not, change said first predetermined condition in content, if said second predetermined condition is satisfied, wherein said first power management unit sets to a power saving mode said function unit of which components are all unsupplied with power.