1. An information processing device comprising: a clustering standard selection unit selecting a clustering standard, from clustering standards categorizing items into a plurality of clusters, including a first number or more known type clusters in which a probability that an item belonging to a cluster is known to a user is equal to or greater than a first threshold value and a second number or more unknown type clusters in which the probability is equal to or less than a second threshold value which is less than the first threshold value; and an exhibit control unit controlling an exhibit of a cluster or an item based on the selected clustering standard.