1. A computer readable medium recording an information providing program for causing an information providing device to execute a processing of providing information relating to an optional device installable on a target apparatus; said program causing said information providing device to execute: acquiring information relating to the installation status of the optional device on said target apparatus and determining an uninstalled optional device, which is an installable optional device that has not been installed; and displaying an image representing said determined uninstalled optional device to a user, wherein an interface window that comprises a basic settings window and a detail settings window and that serves for a user to perform a setting operation for the target apparatus is provided by the information providing device; and the display of the image representing the uninstalled optional device is performed on the basic settings window.