PROBLEM TO BE SOLVED: To prevent a decrease in accuracy of mealtime.SOLUTION: An information processing device 100 acquires a respiration signal, detects the intensity and cycle of respiration, and estimates mealtime from the frequency of deviation of the intensity and cycle of respiration from predetermined threshold values.SELECTED DRAWING: Figure 1【課題】食事時間の精度低下を抑制すること。【解決手段】情報処理装置100は、呼吸信号を取得し、呼吸の強度と周期を検出し、呼吸の強度と周期が所定の閾値から変動した頻度から食事時間を推定する。【選択図】図1