A document management apparatus is provided in a system that includes a project management unit capable of managing progress of a project to which a user belongs. The document management apparatus includes a reception unit configured to receive a search keyword input by the user and user attribute thereof, a search unit configured to search document information based on the search keyword received by the reception unit, an obtaining unit configured to detect the project to which the user belongs based on the user attribute received by the reception unit, and obtain a phase of the detected project from the project management unit, an extraction unit configured to extract document information which is operated on a number of times that is equal to or more than a threshold value in the project phase obtained by the obtaining unit, from the document information searched by the search unit, and an output unit configured to output the document information searched by the search unit and the document information extracted by the extraction unit to provide the user therewith.