A technology provides a function capable of passively utilizing a multiplicity of contents on networks. An information processing system includes a storage unit storing information, and a control unit. The control unit searches locating information for locating where data exists, and judges whether or not the data located by the locating information comes under a predetermined category. When the data is judged to come under the predetermined category, the storage unit stores the locating information and collects pieces of locating information for locating where the data exist.