5. The method according to claim 4 , further comprising comparing the user characteristic information with the attribute information of the document and, if the attribute information of the document includes an item of the user characteristic information, changing the weight of that item.
4. A document management method for managing a plurality of documents registered in a storage device, the method comprising: acquiring user characteristic information including items for identifying a user, based on login information of the user when the user logs in; storing the user characteristic information of the user as attribute information of a document together with the document in the storage device when the user registers the document in the storage device, and storing weights representing a relevance between the document and each of the items of the user characteristic information of the user as attribute information of the document; acquiring a document from the plurality of documents stored in the storage device, wherein the document has at least one item of user characteristic information of a first user who logs in; and creating a display content to display information according to the user characteristic information of the first user together with an identification for identifying the document, wherein creating the display content includes classifying the identification based on the weight of each of the items stored, wherein, when the first user instructs to print the document by using the identification, the weight corresponding to the at least one item stored in the storage device is updated, and wherein, when the first user instructs to delete the document by using the identification, the weights corresponding to the items of the user characteristic information of the first user are changed, the identification for identifying the document instructed to be deleted disappears, the document remains in the storage device, and the identification is not displayed based on the changed weights the next time the first user logs in.