A first information processing device is configured to customize a first screen to be displayed by an image processing device and a second screen to be displayed by a second information processing device. The first information processing device displays a customizing screen including multiple icon areas similar to the first screen and a second screen. The first information processing device sets an icon designated by a user to an icon area targeted to be customized. The first information processing device generates first screen data and second screen data reflecting the results of customization on the customizing screen.