A numerical controller provided with a function of registration and management of an application and capable of coping with a case in which necessary operation is changed in accordance with a situation, includes an application manager which registers the application to an operation process and manages an operation state and the present operation process among the operation process, and a menu display application which executes display control of a screen based on the operation state of the application acquired from the application manager. The application manager outputs a notification of start of the operation process to the application when the operation process is started, instructs the menu display application to emphasize and display the application when receiving a notification of a request of input of a user from the application, and advances the operation to the next operation process when all applications registered to the present operation process are completed.

A terminal device for assisting operation of a plurality of eyeglass manufacturing apparatuses which are used for performing different processes in manufacturing eyeglasses includes: a communicating device configured to communicate with the plurality of eyeglass manufacturing apparatuses; a processor; and memory storing computer readable instructions, when executed by the processor, causing the terminal device to execute: a setting instruction for setting, according to a process, a specific eyeglass manufacturing apparatus from the plurality of eyeglass manufacturing apparatuses as an eyeglass manufacturing apparatus of which the operation is assisted; and a controlling instruction for controlling the communicating device to send an operating signal input in the terminal device to the specific eyeglass manufacturing apparatus set by the setting instruction or controlling the communicating device to receive an input signal input in the specific eyeglass manufacturing apparatus set by the setting instruction.

A method for operating machinery uses a control unit and a display device for displaying a first user interface of a first application program and at least one second user interface of a second application program. The first user interface and the second user interface form a common display window on the display device.

A terminal device for assisting operation of a plurality of eyeglass manufacturing apparatuses which are used for performing different processes in manufacturing eyeglasses includes: a communicating device configured to communicate with the plurality of eyeglass manufacturing apparatuses; a processor; and memory storing computer readable instructions, when executed by the processor, causing the terminal device to execute: a setting instruction for setting, according to a process, a specific eyeglass manufacturing apparatus from the plurality of eyeglass manufacturing apparatuses as an eyeglass manufacturing apparatus of which the operation is assisted; and a controlling instruction for controlling the communicating device to send an operating signal input in the terminal device to the specific eyeglass manufacturing apparatus set by the setting instruction or controlling the communicating device to receive an input signal input in the specific eyeglass manufacturing apparatus set by the setting instruction.