An image reading system to easily obtain a desired final image by displaying a plurality of images read under various image reading conditions for a direct comparison, and an image reading apparatus to output image data read under the various reading conditions with a single reading operation, and a memory medium to store the control procedures thereof. The image reading system includes an image reading device to read the image of a document by dividing the image into a plurality of areas and to output image signals corresponding to the plurality of areas. A reading condition input device sets a first and a second reading condition under which the image is read. An image processing device converts the image signal corresponding to a first area, among the plurality of areas, into a first image signal based on the first image reading condition, and converts the image signal corresponding to a second area into a second image reading based on the second image reading condition. A display then displays respective images according to the first and second image signals.