Bookbinding apparatus and image forming system

An image forming system including a bookbinding apparatus and an image forming apparatus, comprising:

• an image forming unit which forms an image on a sheet;
• a conveying unit which sequentially conveys sheets on each of which an image is formed by the image forming unit;
• a gluing unit which glues the sheets conveyed by the conveying unit;
• a stacking unit which sequentially stacks the sheets glued by the gluing unit;
• a pressurizing unit which pressurizes glued portions of the sheets stacked on the stacking unit;
• and
• a control unit which temporarily stops a stacking process carried out by the conveying unit onto the stacking unit, and causes the pressurizing unit to execute a pressurizing process on the sheets stacked on the stacking unit when an operation interrupting event occurs during the stacking process.