Generally, in accordance with one embodiment, an image forming apparatus comprises a communication section, a storage section, an operation section, an image forming section, and a controller. The communication section receives print data. The storage section stores print data in a print data area. The operation section receives an operation input. The image forming section forms, if the operation section receives a printing instruction of print data, an image on a sheet based on the print data. The controller moves the print data which are not printed even a given period has passed since the print data is received by the communication section from a print data area to other storage area.