An image forming apparatus has a plurality of trays to store an index sheet provided with a tab at a predetermined position of the index sheet, a setting section to set first information concerning the index sheet stored in the tray for each of the plurality of trays, a receiving section to receive second information concerning an insertion of the index sheet in a job, and a controller to control an execution of the job and an operation of feeding the index sheet. The controller automatically selects the tray in the execution of the job based on the first information and the second information.