The invention concerns a network system for radiographing radiation images. The network system includes a plurality of radiation-image reading apparatus to read the radiation images stored in radiation-image storing sheets, so as to generate image data sets each of which corresponds to each of the radiation images, and a plurality of controllers to register discrimination information sets each of which corresponds to each of the radiation-image storing sheets. Each of the controllers can display a radiation image for confirmation, when it receives an image data set corresponding to the radiation image. A radiation-image reading apparatus reads a discrimination information set recorded on a radiation-image storing sheet loaded into the radiation-image reading apparatus.