To secure the capacity of a storing unit by quickly searching and deleting unnecessary electronic information from the storing unit, an electronic information management server has a feature extracting unit extracting a feature of electronic information stored in a storing unit connected to a network, a deciding unit that decides whether the electronic information is to be deleted from the feature extracted by the feature extracting unit based on an instruction from a client, and a deleting unit that deletes from the storing unit via the network the electronic information decided to be deleted by the deciding unit.