The contents of a print-file-selection settings file “SELFL.TXT” have folder path “/FLD1” and print attribute settings file path “/PTYFL.TXT” which are provided to print file decision section and file detection section, respectively. The print file decision section successively provides the contents of each of PDF files in folder “FLD1” to bitmap conversion section. The file detection section reads the contents of “PTYFL.TXT”, provides print attribute values to bitmap conversion section, and print control values to printer. The bitmap conversion section converts the contents of a PDF file into one in PDL, further into bitmap format, and sends it to the printer. Alternatively, the number of characters N of each filenames to be displayed is obtained, the number of files M whose N exceeds N0 is counted, and if this exceeds M0, all the filenames together with their file IDs are automatically printed.