1. A document management apparatus that includes at least one processor configured to search at least one document group saved in advance for a document group having attributes that correspond to a search condition, the apparatus comprising: an updating unit configured to update the attributes of the document group in accordance with an operation performed by a user on a document in the document group; and a search unit configured to search for a document group having attributes that correspond to user information inputted from the exterior, wherein the attributes of the document group include at least one item, and each item has an index value indicating a weight, and the apparatus further comprises: a classification unit configured to classify document groups found by the search unit into the item, among the items, that has the index value that indicates the highest weight; and a display unit configured to display the document group so as to be identifiable based on classification along with the item into which the document group was classified by the classification unit.