Provided is an image forming apparatus for shortening time to printout at time of receiving a print job in a sleep state when an image forming apparatus has an unmounting state of a storage device, such as HDD. A control part notifies printing preparation and a printing process to print engine based on a processing result of an analyzing part. At time of suppressing temperature of fixing device, if received data are analyzed and print data are generated, analyzing part sends a notice of first drawing object being generated to the control part. The control part confirms a connecting state of HDD in response to the notice. If HDD is in an unmounting state, the control part notifies the printing preparation to the print engine.