First storage stores code data each of which is formed by arranging identification at head of line code data obtained by coding image in a line unit, from first to last line of the image. Second storage recognizes the identification from the code data read by First reader to store the code data in a line unit. Third storage stores decoded image obtained by decoding the code data read from the second storage by Second reader in a line unit. When the image is rotated 180 degrees, First reader reads the code data from First storage from the last to the first line and reads each line from an end to a head of the line, Second reader reads the code data from Second storage from the identification to the end of the line, and Third reader reads the decoded image from the end to the head of the line.