PURPOSE: To effectively use a buffer memory of a printer device by a method wherein shared data, individual data, and data managing information, which are received by the printer device, are respectively written into exclusive memories, and the shared data and the individual data are read based on the data managing information to be printed out.

CONSTITUTION: A data transmission part 110 is provided with a first shared data storage memory 111, a first individual data storage memory 112, and a first data managing table memory 113. The aforesaid memories 111-113 separately transmit data to a printer device 120 by a data transmission means 114. In this case, the transmitted data are separately stored in a second shared data storage memory 122, a second individual data storage memory 123, and a second data managing table memory 124 by a data writing means 121. The data are read out of the memories 122, 123 by a data reading means 125 on the basis of the data managing information in the memory 124. Succeedingly, the read data is printed out by a data print-out means 126.