Provided is an image forming apparatus that performs printout processing smoothly, even if printout from apparatus having no spooler, such as a tablet or a smart phone. The image forming apparatus includes the port for printing and an application executing part. The port for printing acquires a print job transmitted from an external apparatus without using spooler function. The application executing part works on a specified platform. The application executing part receives the print job from the external apparatus via a network. Then, the application executing part confirms whether or not the print buffer has space to the port for printing. When the print buffer cannot be used, an application executing part notifies the external apparatus for stopping the transmission of the print job until it becomes available.