Provided are an information processing device, an information processing method, and a program with which it is possible to appropriately carry out cultivation assistance for raising plants. An information processing device 10 comprises: a prediction unit 14a for predicting the growth stage of plants after a prescribed time has elapsed on the basis of information that includes the state of the plants and the moment or time of observations or measurements, at least one item selected from the group comprising the amount of sunlight, the fertilizer concentration in soil or a culture medium, the amount of fertilizer that has been consumed, the carbon dioxide concentration, the humidity, the future, present or past weather, wind and temperature, and cumulative temperature, and the moisture content in the soil or culture medium, all of which have been input by first to third input units 12a, 12b, 12c and a calculation unit 14b that calculates, for the predicted growth stage of the plants after the prescribed time has elapsed, the next supply timing and supply quantity of liquid containing water so that the moisture in the soil or culture medium reaches a prescribed level.La présente invention concerne un dispositif de traitement dinformations, un procédé de traitement dinformations et un programme avec lesquels il est possible de conduire de manière appropriée une assistance de culture pour cultiver des plantes. Un dispositif de traitement dinformations 10 comprend : une unité de prédiction 14a pour prédire le stade de croissance de plantes après quun temps prescrit se soit écoulé sur la base dinformations qui comprennent létat des plantes et le moment ou le temps dobservations ou de mesures, au moins un élément choisi dans le groupe comprenant la quantité de lumière solaire, la concentration dengrais dans le sol ou un milieu de culture, la quantité dengrais qui a été consommée, la concentration de dioxyde de carbone, lhumidité, les conditions météorologiques, le vent et
