Printer and printing method

A printer including a printing portion that performs printing on a printing paper sheet, and a control unit that controls the printing portion, the printer comprising:

• a printer main body including the printing portion and the control unit;
• and
• a memory that stores a content of printing data for printing by the printer main body, the memory being for connection to the printer main body and a reading device connected to the printer main body, the reading device for optically or electromagnetically reading various kinds of operation code by the printer, wherein
• the control unit collates a collation keyword included in the operation code read by the reading device and a collation keyword included in the printing data supplied from the memory, and if the collation keywords match, the control unit controls to the printing portion to print onto the printing paper sheet.

A printing method for a printer including:

• a printing portion that performs printing on a printing paper sheet, a control unit that controls the printing portion, and a memory that stores a content of printing data for printing by the printer main body, the memory for connection to the printer main body and a reading device connected to the printer main body for optically or electromagnetically readings various kinds of operation code by the printer, the printing method comprising:
• collating a collation keyword included in the operation code read by the reading device and a collation keyword included in the printing data supplied from the memory;
• and
• controlling the printing portion to print onto the printing paper sheet if the collation keywords match.