A blood glucose measuring instrument is configured to output guidance allowing a subject to take appropriate countermeasure. The blood glucose measuring instrument includes a first setting device for receiving a static limit value wirelessly transmitted from an authenticated external apparatus and setting the static limit value, storage for classifying and storing blood glucose level data acquired by a blood glucose measurement based on classification according to the measurement timing, a second setting device for calculating, using past blood glucose level data stored in classified groups in the storage, a distribution for each classified group and setting a dynamic limit value based on the calculated distribution, and a notifying device which compares blood glucose level data with the static limit value and the dynamic limit value for the classified group to which the blood glucose level data belongs to provide notification about a result of the comparison.
