The present invention provides a teaching box configured such that an operator can optionally change a coloration and a size of a text displayed on a display area. The teaching box includes a main menu area, a pulldown menu area, a status area, a general-purpose area, and a message area, for monitoring and controlling an operation of an industrial robot which is operated in a plurality of modes including a teaching mode and an operation setting mode. The main menu area includes a customization portion operable to change a size and a coloration of a text, and a display portion operable to display the text set by the customization portion.