When a paper sheet is required during execution of a print job, a printing apparatus requests paper sheet information about the states of paper feed trays from the other printing apparatuses. When the other printing apparatuses transmit the paper sheet information, the printing apparatus of the request source displays a search result display screen 22 which represents the states, such as the size, type, and residual amount of paper sheet in the paper feed tray of each of the other printing apparatuses. By viewing the screen 22, the user is able to determine the position of the printing apparatus and the paper feed tray, in which the required paper sheet is stored. Therefore, when the paper sheet is required during execution of the print job, the paper sheet can be quickly replenished by notifying the presence position of the paper sheet.