A process controller controls the information display of a display device and performs a transaction procedure based on the information input from the input device via the input controller. The process controller has a group display unit. The group display unit previously groups display information to the screen of the display device based on an input made by a user via the input device and the internal state of the process controller for each associative information, and displays the display information on the screen of the display device group by group in a systematically organized form. The state of a transfer procedures is displayed by three general groups affixed with, for example, tabs, and an input format in the style of the image of a slip. This allows the user to easily grasp the operation state during operation and also presents a friendlier input style to the user.