PURPOSE: To easily select each teeth by pressing down a cursor moving key by displaying a movable indication mark on a picture for the purpose of indication at the time of the input and correction of the data corresponding to a teeth state.

CONSTITUTION: The state figure is displayed on the picture of a CRT display 4 to successively key in the results of diagnosis and treatment. An arrow 13 as an indication mark appears on the picture and the state of the teeth, final treatment, calculation date, disease name and disease date of a patient at every one teeth are keyed in, and 32 upper, lower, left and right teeth in total are stored in an oral cavity data file 8. The inputted data are stored in each patient individual data file 7 and the oral cavity data file 8 through a data processing part corresponding to the pushing-down of a cursor moving key by a region judge part 3 and displayed on the CRT display 4. By this method, an operator can indicate the region of each tooth easily.