An image forming apparatus includes a private port selected from a group composed of a plurality of user's private ports assigned to a plurality of users, individually, and two or more function-only ports, a reception buffer which temporarily saves a print job received through the private port, and a setting/save section which is provided corresponding to the private port and saves set data on the printing system. A printing section of the apparatus reads the set data on the printing system from the setting/save section corresponding to the user's private port through which the print job is received when the print job stored in the reception buffer is printed and prints the job in accordance with the set data.