Provided is a user interface method of a program for converting a layout of a semiconductor into a generator, the user interface method including displaying, by a terminal performing the program, an interaction button for displaying an interaction to be performed by a user in a layout view and an expression view, the layout view displaying a layout of a semiconductor being converted into a generator, and displaying, by the terminal, pseudo code matching the user's interaction on an expression window of the expression view when the user clicks the interaction button.