A printer which is connected to a post-processing apparatus, the post-processing apparatus performing a wrapped binding in which a paper sheet bundle including a plurality of inner paper sheets is wrapped by outer paper sheets, and which prints the outer paper sheets and inner paper sheets to be sent out to the post-processing apparatus, wherein the printer includes a control unit configured to control printing of the inner paper sheets and the outer paper sheets in cooperation with the post-processing apparatus, and the control unit is configured to set printing restart information of inner paper sheets and printing restart information of outer paper sheets, and controls a restarting of printing in accordance with the setting, when printing is restarted after an abnormal conveyance that occurred inside of the post-processing apparatus has been resolved.