Patent ID: 7742179

Claim:
A data processing apparatus for communicating with a plurality of information processing apparatuses through a network and for controlling an image forming apparatus, the data processing apparatus comprising: a storing unit that stores a condition for transitioning a state of supplying power of a power source unit to each device in the image forming apparatus; a requesting unit that requests each of the plurality of information processing apparatuses on the network to provide at least information about application software that is running on each of the plurality of information processing apparatuses; an examining unit that examines that specific application software that has a specific process name is running on each of the plurality of information processing apparatuses based on the information provided from the respective information processing apparatuses through the network, the specific application software being capable of issuing a print job to the image forming apparatus; and a power control unit that controls the state of supplying power of the power source unit to each device in the image forming apparatus based on a number of the information processing apparatus on which the specific application software is running and the condition stored by the storing unit.