Drawbacks in the prior technology, such as operation histories of other persons having a low possibility of re-use are also displayed and the operation history of the operator himself becomes difficult to find and an older operation history is deleted by an operation of another person when the memory of the operation history reaches an upper limit of the memory, can be resolved. To enable the operator to easily select and re-use a desired operation history, a main controller executes an individual authentication for authenticating an operator, an operation history based on an input operation instruction is stored in an HDD for each authenticated individual, then an operation history of an authenticated individual is displayed on an LCD panel from thus memorized individual operation histories, an arbitrary operation history is selected from such display and an image forming device is set based on the selected operation history.