PROBLEM TO BE SOLVED: To provide a highly accurate in-vivo measurement system tailored to an individual. SOLUTION: A simple BIA body composition meter 100 as an in-vivo measurement system has a storage unit 110 that stores in-vivo information obtained by measurement of the first accuracy as a reference value, and a second accuracy lower than the first accuracy. The low-precision measuring unit 104 that acquires low-precision internal information by inputting the measured values obtained by various measurements into a predetermined algorithm, the reference value stored in the storage unit 110, and the degree to which the reference value is emphasized. Based on this, the correction unit 112 that corrects the algorithm or low-precision internal information, and the low-precision internal information or low-precision measurement unit 104 acquired by the low-precision measurement unit 104 using the algorithm corrected by the correction unit 112. It is provided with an output unit 106 that outputs the low-precision internal information acquired by the correction unit 112 and corrected by the correction unit 112 as the corrected internal information. [Selection diagram] Fig. 2【課題】 個人に合わせた高精度な体内測定システムを提供する。 【解決手段】 体内測定システムとしての簡易ＢＩＡ体組成計１００は、第１の精度の測定で得られた体内情報を基準値として記憶する記憶部１１０と、第１の精度より低い第２の精度な測定で得られた測定値を所定のアルゴリズムに入力することで低精度体内情報を取得する低精度測定部１０４と、記憶部１１０に記憶された基準値と当該基準値を重視する度合いとに基づいて、アルゴリズム又は低精度体内情報を補正する補正部１１２と、補正部１１２にて補正されたアルゴリズムを用いて低精度測定部１０４にて取得された低精度体内情報、又は低精度測定部１０４にて取得され補正部１１２にて補正された低精度体内情報を、補正体内情報として出力する出力部１０６とを備えている。【選択図】 図２
