Patent ID: 7595900

Claim:
A computer which comprises: a generating unit which generates transmission data to be output to a printing apparatus configured to perform double-sided printing; an adding unit which, when a transmission data management table does not contain any blank table, adds a back side page to an end, adds a blank table to the end, and adds a front side page to the end, and, when the transmission data management table contains a blank table, changes the blank table to a back side page, adds a blank table to the end, and adds a front side page to the end; and a determination unit which determines whether or not double-sided printing is possible in 2-sheet retention, wherein, when said determination unit determines that double-sided printing is impossible in 2-sheet retention, said adding unit adds a back side page to the end and adds a front side page to the end, wherein, when said determination unit determines that double-sided printing is possible in 2-sheet retention and the transmission data management table does not contain any blank table, said adding unit adds to the end a back side page, a blank table and a front side page, and when said determination unit determines that double-sided printing is possible in 2-sheet retention and the transmission data management table contains a blank table, said adding unit changes the blank table to a back side page and adds to the end a blank table and a front side page.