A print data editing program comprising instructions which, when the program is executed on computing means provided in an operation terminal for operating a printed matter producing apparatus that comprises feeding means configured to feed a print-receiving medium and printing means configured to perform printing based on print data on said print-receiving medium fed by said feeding means, and is capable of producing a printed matter wherein desired print is printed on said print-receiving medium based on said print data along a transport direction by said feeding means, causes the computer means to carry out the following steps: a background pattern print data generating step for generating identical background pattern print data respectively to be printed in a plurality of regularly disposed locations in a repeated unit region for repeatedly printing based on a predetermined unit length (Lt) along said transport direction of said print-receiving medium; a disposition setting step for setting a row spacing (Dg) with a disposition direction along a reference direction of said background pattern print data as a row direction, a column spacing (Dr), and an angle of inclination (θ) of said row direction with respect to said transport direction, for said regular disposition of said background pattern print data in said repeated unit region; and a disposition adjusting step (S30, S35, S40, S45, S50, S55, S60) for adjusting said regular disposition set in said disposition setting step so as to impart periodicity with respect to said predetermined unit length (Lt) along said transport direction; in said disposition adjusting step (S30, S35, S40, S45, S50, S55, S60), a rectangular disposition adjustment region that is enclosed by both two sides parallel with said angle of inclination (θ) and two sides orthogonal to said angle of inclination (θ), and comprises a length of the diagonal equal to said predetermined unit length (Lt), being set, and it being performed that at least one spacing adjustment of column spacing adjustment that approximately adjusts said column spacing (Dr) set in said disposition setting step so that a length (Lt; Wg) of the sides parallel with said angle of inclination (θ) in said disposition adjustment region becomes an integer (N1; N2) multiple of a total length of a length (Lg) of said background pattern print data along said row direction and said column spacing (Dr), and row spacing adjustment that approximately adjusts said row spacing (Dg) set in said disposition setting step so that a length (Hr) of the sides orthogonal to said angle of inclination (θ) in said disposition adjustment region becomes an integer multiple of a total length of a length (Lr) of said background pattern print data along said column direction and said row spacing (Dg), wherein an image expansion region is set, being a rectangular region enclosed by two sides parallel with the row direction and two sides parallel with the column direction, and is set so that the four sides respectively pass through any of four vertexes of the repeated unit region, wherein the dot pattern of the background pattern print image is expanded in accordance with the adjusted regular disposition across such an image expansion region in its entirety. a background pattern print data generating step for generating identical background pattern print data respectively to be printed in a plurality of regularly disposed locations in a repeated unit region for repeatedly printing based on a predetermined unit length (Lt) along said transport direction of said print-receiving medium; a disposition setting step for setting a row spacing (Dg) with a disposition direction along a reference direction of said background pattern print data as a row direction, a column spacing (Dr), and an angle of inclination (θ) of said row direction with respect to said transport direction, for said regular disposition of said background pattern print data in said repeated unit region; and a disposition adjusting step (S30, S35, S40, S45, S50, S55, S60) for adjusting said regular disposition set in said disposition setting step so as to impart periodicity with respect to said predetermined unit length (Lt) along said transport direction; in said disposition adjusting step (S30, S35, S40, S45, S50, S55, S60), a rectangular disposition adjustment region that is enclosed by both two sides parallel with said angle of inclination (θ) and two sides orthogonal to said angle of inclination (θ), and comprises a length of the diagonal equal to said predetermined unit length (Lt), being set, and it being performed that at least one spacing adjustment of column spacing adjustment that approximately adjusts said column spacing (Dr) set in said disposition setting step so that a length (Lt; Wg) of the sides parallel with said angle of inclination (θ) in said disposition adjustment region becomes an integer (N1; N2) multiple of a total length of a length (Lg) of said background pattern print data along said row direction and said column spacing (Dr), and row spacing adjustment that approximately adjusts said row spacing (Dg) set in said disposition setting step so that a length (Hr) of the sides orthogonal to said angle of inclination (θ) in said disposition adjustment region becomes an integer multiple of a total length of a length (Lr) of said background pattern print data along said column direction and said row spacing (Dg),