To provide an NC controlling system that is superior in practical use and workability and that may perform an administration of inputting, compiling and storing a control program of a NC machine tool and a control program of an appended equipment together as one program in a NC controlling apparatus, an NC controlling system having an NC machine tool provided with a control program and appended equipment used together with the machine tool to be numerically controlled, wherein a control program of the appended equipment is written in an annotation part of the control program of the NC machine tool, and a reading unit is provided for identifying and reading the control program of the appended equipment written in the annotation part of the control program of the NC machine tool.