An information processing device includes: a heart rate acquisition unit configured to acquire a heart rate of an object a feature extraction unit configured to extract a feature from heart rate fluctuation with respect to time that is acquired by the heart rate acquisition unit a storage configured to, in advance, store information associated with heart rate fluctuation of a drink intake and a determination unit configured to determine whether the heart rate fluctuation acquired by the heart rate acquisition unit is caused by a drink intake, on a basis of the feature extracted by the feature extraction unit and the information stored in the storage.
