Provided is a machine tool, which includes a housing forming the exterior and having at least one transparent window to look inside; a driving part accommodated in the housing and including multiple driving units to process a parent material; a push button on one side of the housing; a memory part in which color information about the abnormal state of each driving unit is stored; a color displaying device installed in the housing and displaying the abnormal state of each driving unit by color; and a control part which controls the color displaying device to display white light to check the inside of the machine tool with the push button being pushed while controlling the color displaying device based on the color information stored in the memory part to check the state of the driving units with the push button not being pushed.
