PURPOSE: To improve the work efficiency related to an input work of data in the case of executing an input of the data by two kinds of data input means of a keyboard and a position input means.
CONSTITUTION: In the case data is inputted from a keyboard 2, a CPU 1 designates a display position on a display screen of a CRT 4, based on position data inputted from the keyboard 2, and displays numerical data inputted from the keyboard 2, in its designated position. On the other hand, in the case data is inputted from a mouse 3, the CPU 1 designates the display position on the display screen of the CRT 4, based on position data inputted from the mouse 3, and displays numerical data corresponding to a variation of the position data inputted from the mouse 3 after its display position is designated, in its designated position.