such as tool number tool length tool length correction value tool diameter tool diameter correction value tool weight gravity center position of the tool tool lifetime tool use frequency and tool use time is stored in the information medium fig3 is a diagram illustrating the machining system comprising the machining tool the handling robot set outside the machining tool and the tool stand set outside the machining tool the handling robot is capable of performing operation of detaching the tool from the tool holding unit located at tool detachment and attachment position of the tool magazine of the machining tool to convey the tool to the tool stand and performing operation of attaching the tool to the tool holding unit located at the tool detachment and attachment position of the tool magazine in a hand unit of the handling robot an information reading and writing device equipped with a magnetic head which is capable of reading and writing of information to the magnetic memory element is provided such that the hand unit is capable of reading and writing information to the information medium of the tool the information reading and writing device the handling robot and the control device of the machining tool are connected through a data cable capable of sending and receiving information fig4 is a schematic diagram illustrating initial operation when the handling robot attached the tool to the tool magazine in the present example a case in which the tool is attached to a tool holding.