An image forming apparatus is provided with a processor, a storage unit for storing a program and data, a function unit for performing functional operations; and an interactive input/output unit. The storage unit includes first storage areas, second storage areas, and third storage areas, which are hierarchized. The program causes the processor to display specified information allotted to the first storage areas on the interactive input/output unit. If one first storage area is selected, information of the second storage areas related to the selected first storage area is displayed on the interactive input/output unit. If one second storage area is selected, information of files in the third storage areas included in the selected second storage area and the names of processes to be performed to the files are displayed on the interactive input/output unit. If the file and process are selected, the process is performed to this file.