A document management apparatus, which converts management of documents managed using a folder tree to management using search folders, newly defines attributes of documents included in respective hierarchies of the folder tree as a conversion source. To each document which belongs to the folder tree, a name of a folder in an upper hierarchy, which stores that document, is assigned as an attribute value of the defined attribute. Each folder which configures the folder tree is converted into a search folder which can search for documents assigned with the attribute values using the name of that folder as a search condition.