Abstract: The present application provides a method for generating operation simulation information of a numerical control device. The method includes: acquiring physical operation information of the numerical control device; acquiring model information corresponding to the numerical control device; generating operation simulation information of the numerical control device based upon the physical operation information and the model information, and outputting the operation simulation information to a client. Embodiments of the application have the advantage that it enables a remote user to see detailed information in a numerical control device operation process, such as a machining workpiece, a cutting tool and an operation procedure, in a visually direct way. This facilitates remote management of a factory by the user.