A printer is provided that can be used easily and preferably without introducing an additional structure into a terminal device and a server. The printer includes a printing process portion for printing based on print data, a print data detection portion for detecting print data stored in a file server, a data reception portion for obtaining print data and the corresponding printing conditions information from the file server when the print data are detected, a print approval/disapproval judge portion for judging approval/disapproval of printing based on the obtained printing conditions information and a print control portion for controlling the printing process portion so that printing is performed based on print data corresponding to the printing conditions information when it is determined to be printable, and for controlling the same so that printing is not performed when it is determined to be unprintable.