As for this invention, in the civil engineering works machine instrument 1 where general-purpose micro-computer 2 is loaded individual information of serial number and the like various programs it is something which designates that the civil engineering works machine instrument of the general-purpose micro-computer on-board type which can write separately easily from outside is obtained as topic. For example this invention, the civil engineering works machine instrument where micro-computer 2 is mounted 1 (, the commonness program to the aforementioned micro-computer 2 and it changes to individual information entry mode at the time of mode change signal input and the concrete vibrator) in, the mode means for switching which make the input of individual information possible are recorded, the terminal 4 which is connected to the aforementioned mode change signal and the port 31 in order to input individual information is installed by the aforementioned machine instrument 1, in order to be able to input individual information into the micro-computer 2 which is mounted on machine instrument 1 via the aforementioned port 31 constitutes.
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