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 reflecting the criterion projection characteristic information to received images so as to covert the received images into processed images; an image characteristic obtaining unit projecting the white light and black light onto an object projection screen so as to obtain object projection characteristic information; an image improvement unit reflecting the object projection characteristic information to the processed images so as to convert the processed images into the improved images; and a second image converter reflecting the criterion projection characteristic information and the object projection characteristic information to the improved images so as to convert the improved images into the output images.