To provide a bookbinding system capable of efficiently consuming a glue sheet according to a booklet type.

In a bookbinding system in a certain form, when the near-end of a glue sheet is detected, a control unit obtains the number of booklets allowed to continue, which is the number of booklets capable of being subsequently subjected to a gluing process, on the basis of the unit number of sheets for one booklet, which is the number of sheets per booklet, a remaining guaranteed length, and a transfer length. After the near-end detection, the control unit continues the gluing process for the booklets permitted to continue and then stops the gluing process.