PURPOSE: To improve operability and to generate a desired graph through simple operation by using a tablet as an input means, and providing this tablet with a menu mode meaning.

CONSTITUTION: There are title name, longitudinal axis unit name, longitudinal axis name, lateral axis name, comment, etc., as explanatory items to be inputted. When the title name is inputted, an item "title name" 351 in a graph specifying item 320 is indicated with an indication pen 2 and a code input item 351 and a KANJI (Chinese character) and KANA (Japanese syllabary) input item 352 in the 2nd menu sheet 35 are used to indicate title characters. At this time, "title name = departmental sales amount", for example, is displayed on a display device 4 and inputted. Consequently, the title is drawn at a specific position in a graph. Other explanatory items are inputted simultaneously and the graph is completed. When an item "plotting" of a command item 319 is indicated, a graph is drawn on plotter.