To prepare an objective site area having boundary information suited to an objective picture.
This dental picture managing device is provided with functions for obtaining reference site area information which stores the boundary information of respective reference site areas, which is expressed by using the first coordinate system having a group of the reference site areas provided corresponding to a group of teeth plotted by prescribed arrangement and having a characteristic origin, coordinated with the respective reference site areas (S01), converting the boundary information of the respective reference site areas respectively to the values of the second coordinate system based on a designated point designated by operation input into the objective picture, in which the group of teeth are plotted by the prescribed arrangement and which is displayed by using the second coordinate system, and the characteristic origin (S05 to S11), and storing each converted boundary information as an objective site area coordinated with the reference site area, with which each boundary information has been coordinated before conversion, and the objective picture (S19).
KANBE MASAMI
KUNIYUKI OSAMU
