PURPOSE: To save a memory in a logger, by rewriting data of each terminal device, based on the coincidence retrievel between a data pattern code to added each data in a data logger and that set to the terminal device.

CONSTITUTION: When a start signal S is applied from a logger 2 to an automatic ticket sales machine 1-A, a sales pattern code CA is applied to the device 2 from the machine 1-A. The device 2 selects a storage area MA in which the data of the same code is stored based on the code CA, supplies the data DMA in the area MA to the machine 1-A and rewrites the data in the storage section of the machine 1-A. The start signal S is applied to a machine 1-B from the device 2 and the data in the automatic ticket sales machine (n) are written similarly with the start signal S.