1. An estimation apparatus comprising: image input means for inputting image data of a user; voice input means for inputting voice data of the user; living body information input means for inputting living body information of the user; an event log recording means for recording an event log including a time at which a remedial action was taken by a person other than the user; first estimation means for estimating a surrounding environment of the user on the basis of the image data, voice data, and living body information; holding means for holding reference data serving as a reference used upon estimating a psychological state of the user; second estimation means for estimating the psychological state of the user by comparing at least one of the image data, voice data, and living body information with the reference data; calculation means for calculating an elapsed time from the last time in the event log at which the remedial action was taken by a person other than the user; third estimation means for, when the psychological state of the user estimated by the second estimation means is a predetermined psychological state, estimating a cause of the predetermined psychological state of the user on the basis of the surrounding environment estimated by the first estimation means and the elapsed time calculated by the calculation means; and instruction means for instructing a person other than the user to perform a remedial action for removing the cause of the predetermined psychological state of the user estimated by the third estimation means.