1. A screen creating system for creating a screen to be displayed on a programmable display, the screen creating system comprising: a display unit that displays a drawing screen; a property-information managing unit that manages property information of components configuring the drawing screen; a list display unit configured to acquire the property information of a component selected by a user from the property-information managing unit, display the acquired property information of the component on the display unit, and edit a predetermined setting item of setting items configuring the displayed property information; and a regularity determining unit that compares values of adjacent setting items configuring the property information and determines where there is regularity in which differences or quotients between the values are the same value, and in a case of determining that there is the regularity in the adjacent setting items, instructs the list display unit to highlight a setting item having the regularity on the display unit, wherein the list display unit transmits the acquired property information of the component to the regularity determining unit and operates based on the instruction from the regularity determining unit.