[Problem] To provide an information processing device, information processing system, and information processing method, which are capable, while viewing a progress of a state quantity which indicates a characteristic change in estrus in a domesticated animal, of assessing the estrus of each individual domesticated animal, and which, when estrus has occurred, are capable of executing a contact with a veterinarian and accumulation of estrus information by an operation which notifies the veterinarian of the onset of estrus. [Solution] Provided is an information processing device, comprising: a display information control unit which causes a display unit of a breeder-side information terminal to display a progress of a state quantity which indicates a characteristic change in estrus of a domesticated animal； and a notification control unit which, according to a notification request, for notifying a veterinarian-side information terminal of estrus of the domesticated animal, which is based on an operation upon the breeder-side information terminal, executes both a notification process upon the veterinarian-side information terminal, and a registration process which registers, in a database as an estrus history of the domesticated animal, time information which indicates the time at which the notification request occurred.Le problème décrit par la présente invention est de proposer un dispositif de traitement d'informations, un système de traitement d'informations et un procédé de traitement d'informations, permettant, tout en visualisant une progression d'une quantité d'état qui indique un changement de caractéristique dans l'œstrus chez un animal domestique, d'évaluer l'œstrus de chaque animal domestique individuel, et, lorsqu'un œstrus s'est produit, de réaliser un contact avec un vétérinaire et une somme d'informations d'œstrus par une opération qui notifie le vétérinaire de l'apparition d'œstrus. La solution selon l'invention concerne un dispositif de traitement d'i
