To provide an information processing device, an information processing method and an information processing program for estimating a situation of a subject.SOLUTION: The information processing device includes: a signal acquisition unit that acquires a signal representing a movement of a subject from a sensor that detects a movement of the subject; a measuring unit that measures at least one of an activity amount and the number of steps of the subject on the basis of the signal representing the movement of the subject; and an estimation unit that estimates a situation of the subject on the basis of at least one of the activity amount and the number of steps.SELECTED DRAWING: Figure 7【課題】対象者の状況を推定する情報処理装置、情報処理方法及び情報処理プログラムを提供する。【解決手段】情報処理装置は、対象者の動きを検出するセンサから前記対象者の動きを表す信号を取得する信号取得部と、前記対象者の動きを表す信号に基づいて前記対象者の活動量及び歩数の少なくとも一方を計測する計測部と、前記活動量及び前記歩数の少なくとも一方に基づいて、前記対象者の状況を推定する推定部とを備える情報処理装置。【選択図】図7