Patent ID: 7890004

Claim:
An image forming apparatus that is adapted for connection with a post-processing apparatus that post processes sheets and that controls a sheet conveying speed according to the sheet thickness, the image forming apparatus comprising: a containing device configured to contain sheets; a selecting device having a display device configured to display a plurality of candidates for sheet thicknesses and configured to permit a user to select a thickness of sheets contained in said containing device among the plurality of candidates for the sheet thicknesses; an obtaining device configured to obtain first thickness-determination information used for controlling the sheet conveying speed in the post-processing apparatus from the post-processing apparatus and second thickness-determination information for controlling the sheet conveying speed in the image forming apparatus, each of the first thickness-determination information and the second thickness-determination information including threshold information for grouping the respective sheet thicknesses; and a determining device configured to determine a plurality of candidates for the sheet thicknesses to be displayed on said display device, based on the first thickness-determination information and the second thickness-determination information obtained by said obtaining device.