To accurately and easily select an optimal plant suited to a purpose.

Questions suited to the use and purpose of a plant are successively displayed on the display screen of a display device 12, and answers to the questions are obtained by the operation of a panel switch 13 provided at the display device 12. Thus, the designation of the several kinds of plants suited to the use and purpose can be displayed. When the name of the displayed plant is selected by the operation of the touch panel 13, information related with the plant is displayed.