1. A content management device for managing acquired content in a searchable manner, the device comprising: a storage device configured to store a search database in which a plurality of keywords and content are registered; a registration unit configured to register new content in the search database; and a search unit configured to search content registered in the search database, wherein the registration unit is configured to perform operations comprising: extracting a plurality of keyword candidates associated with the new content from the search database based on the new content and meta data, which is generated when the new content is acquired, and which comprises information varying according to an acquisition path along which the new content is acquired; displaying the extracted keyword candidates; and registering a keyword candidate designated from among the displayed keyword candidates in the search database, as a search keyword in association with the new content, and wherein the search unit is configured to perform operations comprising: displaying a plurality of search keywords which already have been registered by the registration unit in the search database; extracting content, which is associated with a search keyword designated from among the displayed search keywords, and which already has been registered by the registration unit in the search database, from the search database; and displaying the extracted content, wherein the meta data includes one of information indicating that the acquisition path includes a facsimile reception, information indicating that the acquisition path includes a facsimile transmission, information indicating that the acquisition path includes a copy, and information indicating that the acquisition path includes a scan.