25. The method according to claim 24 , further comprising the step of: analyzing said image data and extracting a document characteristic value, wherein: said step of generating expected image finish information generates said expected image finish information based on said document characteristic value extracted in said step of analyzing, and said step of generating input setting screen information generates said input setting screen information based on said document characteristic value extracted in said step of analyzing.
26. The method according to claim 25 , wherein, if a portion in said input setting screen, resulting from said input setting screen information generated in said step of generating, is different from that corresponding to said portion in an initial input setting screen, resulting from initial setting values, said step of displaying an expected image finish displays said portion with emphasis.