Machining simulation display apparatus and machining simulation display method

A machining simulation display method performed by a machining simulation display apparatus that displays, on a display screen, an image of a shape of a workpiece and a shape of a tool that machines the workpiece and that displays an animation of a process of machining the workpiece and a process of moving the tool, the method comprising:

• determining a change point on a trajectory of the tool between a first display update timing at which the image displayed on the display screen is updated and a second display update timing that is a time point after a lapse of a constant display update interval since the first display update timing;
• combining an image of the shape of the workpiece updated at the first display update timing and an image of the shape of the tool updated at the change point and displaying a combined image on the display screen;
• and
• combining an image of the shape of the workpiece updated at the second display update timing and an image of the shape of the tool updated at the second display update timing and displaying a combined image on the display screen.