An image forming apparatus includes a printer section configured to print image data to a paper according to a print job, a control panel configured to receive instructions regarding the print job, a first discharging tray configured to receive the printed paper, and an second discharging tray configured to be opened and closed, to receive the printed paper when opened, and guide the printed paper to the first discharging tray when closed. The image forming apparatus further includes a detection section configured to detect whether the second discharging tray is open or closed, and a control section configured to control execution of the print job including controlling the printer section based on the instructions received in the control panel and the detection result of the detection section.