The present invention is made to prevent accident of mistaking blood glucose meter among a plurality of blood glucose meters used in a hospital ward.The blood glucose meter is provided with a nickname area in a nonvolatile storage thereof, and the nickname area can be written from outside. Further, when the blood glucose meter is powered on, a nickname is displayed on a display thereof. A measurement data managing device is provided with a blood glucose meter individual setting table in which the serial number and the nickname of the blood glucose meter are is register in association with each other. When the measurement data managing device is connected with the blood glucose meter and communication is started, the serial number of the blood glucose meter is automatically read out, and the nickname obtained from the blood glucose meter individual setting table is displayed on the display.