1. An apparatus for projecting images in consideration of a screen condition, the apparatus comprising: a device characteristic storage unit storing criterion projection characteristic information to be obtained when white light, black light and colored light are projected onto a criterion projection screen; a first image converter to convert received images into processed images by reflecting the criterion projection characteristic information to the received images; an image characteristic obtaining unit to obtain object projection characteristic information by projecting the white light and black light onto an object projection screen; an image improvement unit to convert the processed images into improved images by reflecting the object projection characteristic information to the processed images; and a second image converter to convert the improved images into output images by reflecting the criterion projection characteristic information and the object projection characteristic information to the improved images.