PROBLEM TO BE SOLVED: To predict a change in cognitive ability of a user and perform user management more appropriately.SOLUTION: Learning data is created beforehand, and is stored in learning data accumulation means 4. In this state, heartbeat interval data on an object user is received from data input means 2 in a time-series manner, and an HRV feature amount is calculated from the heartbeat interval data for each predetermined time section. Successively, an HRV change amount based on the HRV feature amount calculated for each time section is calculated. Then, the learning data stored in the learning data accumulation means 4 is referred to, and a future change amount of the cognitive ability of the object user is predicted based on the calculated HRV feature amount and the HRV change amount. Information indicating the predicted change mount of the cognitive ability is output to result output means 3, and presented to the object user, an administrator, etc.SELECTED DRAWING: Figure 1【課題】ユーザの認知能力の変化を予測し、ユーザ管理をより適切に行えるようにする。【解決手段】事前に学習データを作成して学習データ蓄積手段４に記憶しておく。この状態で、データ入力手段２から対象ユーザの心拍間隔データを時系列で受け取り、当該心拍間隔データから所定の時間区間ごとにHRV特徴量を算出する。続いて上記時間区間ごとに算出されたHRV特徴量をもとにHRV変化量を算出する。次に、上記算出されたHRV特徴量およびHRV変化量をもとに、学習データ蓄積手段４に記憶された学習データを参照して対象ユーザの認知能力の今後の変化量を予測する。そして、上記予測した認知能力の変化量を表す情報を結果出力手段３へ出力し、対象ユーザや管理者等に提示する。【選択図】図１
