A mode information conversion device connected to a terminal and an image forming device which performs a printing operation. The mode information conversion device comprises an unit for receiving first mode information transmitted from the terminal, in which a user request to the image forming device is reflected; an unit for acquiring second mode information to be peculiarly used in the image forming device; an unit for registering the first and second mode information so as to be previously related to each other; an unit for converting the first mode information to the second mode information by reading the second mode information related to the first mode information on the mode information registering unit upon receiving the first mode information; and an unit for transmitting the second mode information acquired by conversion to the image forming device which is a print output destination based on the user request.