<;P>;PROBLEM TO BE SOLVED: To provide a blood sugar meter which can judge whether the medicine filling an injector is proper in type or not and generates a warning if it is not proper by determining the type of the medicine to be dosed from the blood sugar value at each time of dosing and the dosage from the prescription data. <;P>;SOLUTION: The type and dosage of insulin to be dosed to a patient are stored related to the blood sugar value of the patient and the time range in which the measurement of the blood sugar value by a blood sugar value measuring means is made and the type and dosage of the insulin to be dosed are determined from the measurement time range and the measured value. The type of the insulin in a cartridge is specified by communication with an IC tag attached to an insulin cartridge placed onto an insulin injector and an application permission or a warning is notified of from the coincidence of the type with that of the insulin determined. <;P>;COPYRIGHT: (C)2008,JPO&INPIT