In a screen image for a user to operate other processing unit while one processing unit is in an editing state, icons of [A: EDITING-COMPLETE], [B: EDITING-HALT], [C: EDITING], [D: EDITING-COMPLETE], [E: EDITING-HALT (CALCULATING)] and [OPERATION GUI] are included. The [OPERATION GUI] shows a GUI for operating the processing unit corresponding to [C: EDITING] . In an image processing method, the "editing-halt" state can be provided, enabling the user to operate the other processing unit while one processing unit is in the editing state. Accordingly, while the user is operating a complicated processing unit such as a cardiac function analysis, the user can once stop editing the cardiac function analysis as required, and can execute a voxel value measurement, mask setting processing, etc., for example, and then can resume editing of the cardiac function analysis.