A device information displaying system for displaying device internal information of one or more information devices includes: information browser means which acquires and analyzes document data described in a markup language, converts the acquired document data into layout data having a prescribed structure based on result of the analysis, and makes a display based on the layout data; and device information providing means which acquires the device internal information of the one or more information devices, generates display data containing the device internal information and having a structure equivalent to the prescribed structure of the layout data generated by the information browser means, and displays the generated display data through the information browser means.