To reduce the cost of a machine tool remarkably by lessening its assembling and maintaining work remarkably.

The machine tool has a reference shaft line S and a first movable shaft U and a second movable shaft W laid in a reference plane that includes the reference shaft line so as to move a tool and a work relative to each other. The machine tool is provided with a procedure for storing data that are used to determine the angle the first and second movable shafts form and the angle the reference shaft line and the second movable shaft form, a procedure for indicating the relative movement of a tool and a work with coordinate values on a first coordinate axis X in a rectangular coordinate system on the reference plane including the reference shaft line and on a second coordinate axis Z made parallel to the reference shaft line, a procedure for computing the movement of the first and second movable shafts that meets a predetermined operation expression from the coordinate components of the relative movement on the first and second coordinate axes, and a procedure for moving the tool and the work relative to each other on the basis of the computed movement.