1. A printing apparatus creating a bookbinding print-output, the printing apparatus comprising: an obtaining means configured to obtain a security level associated with a first original image and a security level associated with a second original image by detecting a first two-dimensional code and a second two-dimensional code and extracting information included in each of the first and second two-dimensional codes,, characterized in that the printing apparatus further comprises: a determination means configured to determine the higher security level by comparing the security level of the first two-dimensional code and the security level of the second two-dimensional code, means configured to delete the first and second two-dimensional codes from the first and second original images; means configured to reduce the first original image to produce a fist reduced image and to reduce the second original image to produce a second reduced image, and an arrangement means configured to arrange the first reduced image and a two-dimensional code which includes the determined higher security level in a first page of a two-page spread and the second reduced image and a two-dimensional code which includes the determined higher security level in a second page of the two-page spread, wherein the position at which the arrangement means arranges the two-dimensional code in the first page is within a predetermined area of the first page of the two-page spread in which the two-dimensional code is detectable as a code, and the position at which the arrangement means arranges the two-dimensional code in the second page is outside the predetermined area of the first page of the two-page spread and constitutes a predetermined area in which the two-dimensional code is detectable as a code with respect to the second page alone. an obtaining means configured to obtain a security level associated with a first original image and a security level associated with a second original image by detecting a first two-dimensional code and a second two-dimensional code and extracting information included in each of the first and second two-dimensional codes,, characterized in that the printing apparatus further comprises: a determination means configured to determine the higher security level by comparing the security level of the first two-dimensional code and the security level of the second two-dimensional code, means configured to delete the first and second two-dimensional codes from the first and second original images; means configured to reduce the first original image to produce a fist reduced image and to reduce the second original image to produce a second reduced image, and an arrangement means configured to arrange the first reduced image and a two-dimensional code which includes the determined higher security level in a first page of a two-page spread and the second reduced image and a two-dimensional code which includes the determined higher security level in a second page of the two-page spread, wherein the position at which the arrangement means arranges the two-dimensional code in the first page is within a predetermined area of the first page of the two-page spread in which the two-dimensional code is detectable as a code, and the position at which the arrangement means arranges the two-dimensional code in the second page is outside the predetermined area of the first page of the two-page spread and constitutes a predetermined area in which the two-dimensional code is detectable as a code with respect to the second page alone. a determination means configured to determine the higher security level by comparing the security level of the first two-dimensional code and the security level of the second two-dimensional code, means configured to delete the first and second two-dimensional codes from the first and second original images; means configured to reduce the first original image to produce a fist reduced image and to reduce the second original image to produce a second reduced image, and an arrangement means configured to arrange the first reduced image and a two-dimensional code which includes the determined higher security level in a first page of a two-page spread and the second reduced image and a two-dimensional code which includes the determined higher security level in a second page of the two-page spread, wherein the position at which the arrangement means arranges the two-dimensional code in the first page is within a predetermined area of the first page of the two-page spread in which the two-dimensional code is detectable as a code, and the position at which the arrangement means arranges the two-dimensional code in the second page is outside the predetermined area of the first page of the two-page spread and constitutes a predetermined area in which the two-dimensional code is detectable as a code with respect to the second page alone.