According to an embodiment, an image forming apparatus measures a temperature of a pressing member and controls heat generation of a heater such that the measured temperature approaches a control temperature. Further, the image forming apparatus sets, before starting image formation of one job including image formation, one candidate temperature of a plurality of predetermined candidate temperatures different from each other as the control temperature on the basis of the number of sheets to be used and a sheet size to be used in the image formation of the one job.

An information processing apparatus controls an image forming apparatus to form an image, with an image forming speed of the image forming apparatus being controlled. The information processing apparatus includes an interface to acquire sheet information related to a sheet on which the image is to be formed by the image forming apparatus, and a controller to receive user instruction information for adjusting an image forming speed for a certain mode included in a plurality of modes and to control the image forming speed for the certain mode based on the user instruction information and the sheet information.

An image forming apparatus includes a fixing roller to fix an image by heating a sheet on which the image is transferred and to convey the sheet. In a case in which a first plain paper of which a sheet length in a sheet conveyance direction is equal to or more than a predetermined length is conveyed, the fixing roller conveys the first plain paper at a first speed. In a case in which a second plain paper of which the sheet length is less than the predetermined length is conveyed, the fixing roller conveys the second plain paper at a second speed less than the first speed. In a case in which an envelope of which the sheet length is less than the predetermined length is conveyed, the fixing roller conveys the second envelope at the first speed.