Methods and apparatus for setting a text composition spacing amount in a DTP system. Each switch card is connected to all client cards, all line cards, and all other switch cards, and each client card, line card and switch card includes control logic for managing an operation of the ODU switch in a distributed manner. The chip further includes a base on which the semiconductor layer stack is arranged, and a mirror layer, which is arranged between the semiconductor layer stack and the base. After correction of the table structure, characters in each cell of the corrected table structure are recognized, and table format data is generated and output on the basis of the recognition result and table structure.