Abstract: According to the present disclosure, a method includes, wherein a processor, acquiring an activity quantity data of an animal, calculating an exercise consumption energy quantity of the animal based on the activity quantity data, calculating an estimation consumption energy quantity of the animal based on an information of a body weight of the animal, correcting the estimated consumption energy quantity of the animal using the exercise consumption energy quantity of the animal, and outputting an information related to the corrected estimation consumption energy quantity.

Abstract: An information processing system includes: an activity acquiring unit that acquires an activity amount from a sensor mounted on an animal; a storage unit that stores the previously acquired activity amount corresponding to datetime; a behavior identifying unit that identifies a behavior of the animal by frequency analysis of the activity amount; a vitality disappearance determining unit that determines whether the vitality of the animal has disappeared according to whether the activity amount on a particular day is less than a first threshold defined by the activity amount in a period prior to the particular day and whether a number of times or time length of the predetermined behavior on the particular day is less than a second threshold defined by the number of times or the time length during the period; and a notifying unit that notifies that the vitality has disappeared.