An image processing apparatus which receives print data transmitted from an information processing device, includes: a storage for storing the received print data when the data is confidential print data, together with its ID information; an input control portion for allowing for input of ID information; and a controller having the function that, when detecting input of ID information, outputs the confidential print data corresponding to the input ID information and the function of switching the image forming portion from normal power status to power saving status when no print request has been made for a fixed period of time. When the confidential print data has been stored in the storage, the controller gives notice that the image forming portion will transition to the power saving status to the information processing device before the image forming portion transitions to the power saving status, and the controller delays the transition by a predetermined period of time when the controller receives an extension request from the information processing device to postpone the transition of the image forming portion to the power saving status.