A print processing apparatus configured to process an input print job and configured to transmit the processed print job to a printing apparatus, the print processing apparatus comprising: a storage means for storing sheet information about sheets, wherein the sheet information includes sheet basic information including at least a grammage, a surface smoothness and a shape and printer dependency information including at least a curl correction amount; a selection means for selecting, if sheet information including sheet basic information included in the input print job has not been stored in the storage means (S104, YES), sheet information most similar to the basic sheet information included in the print job from among a plurality of pieces of sheet information stored in the storage means, wherein the selection means selects the most similar sheet information by extracting from the plurality of pieces of sheet information stored in the storage means: the selected sheet information having a grammage within a predetermined range of tolerance regarding the print processing apparatus (S201, S202), the selected sheet information having information indicating a surface smoothness that matches a surface smoothness set in the print job (S203, S204), and the selected sheet information having information indicating a shape that matches a shape set in the print job (S205, S206); copying means for copying the selected sheet information into new sheet information; characterized by a registration means for registering the new sheet information generated by the copying means in both the storage means and a database of the printing apparatus; and a transmission means for transmitting (S114, S115) the processed print job, including paper feed source information, the sheet information included in the input print job, and image data, to the printing apparatus after the registration means registers the new sheet information in both the storage means and the database of the printing apparatus, such that the printing apparatus executes the processed print job using the new sheet information registered in the database of the printing apparatus and prints the image data. a storage means for storing sheet information about sheets, wherein the sheet information includes sheet basic information including at least a grammage, a surface smoothness and a shape and printer dependency information including at least a curl correction amount; a selection means for selecting, if sheet information including sheet basic information included in the input print job has not been stored in the storage means (S104, YES), sheet information most similar to the basic sheet information included in the print job from among a plurality of pieces of sheet information stored in the storage means, wherein the selection means selects the most similar sheet information by extracting from the plurality of pieces of sheet information stored in the storage means: the selected sheet information having a grammage within a predetermined range of tolerance regarding the print processing apparatus (S201, S202), the selected sheet information having information indicating a surface smoothness that matches a surface smoothness set in the print job (S203, S204), and the selected sheet information having information indicating a shape that matches a shape set in the print job (S205, S206); the selected sheet information having a grammage within a predetermined range of tolerance regarding the print processing apparatus (S201, S202), the selected sheet information having information indicating a surface smoothness that matches a surface smoothness set in the print job (S203, S204), and the selected sheet information having information indicating a shape that matches a shape set in the print job (S205, S206); copying means for copying the selected sheet information into new sheet information; characterized by a registration means for registering the new sheet information generated by the copying means in both the storage means and a database of the printing apparatus; and a transmission means for transmitting (S114, S115) the processed print job, including paper feed source information, the sheet information included in the input print job, and image data, to the printing apparatus after the registration means registers the new sheet information in both the storage means and the database of the printing apparatus, such that the printing apparatus executes the processed print job using the new sheet information registered in the database of the printing apparatus and prints the image data.