An apparatus and method for furnishing the identification of potential customers that may be interested in a specific product in response to a search request. A first database contains information on, for instance, books and serials in print, in which each individual book or serial is classified. Individuals requesting information regarding specific books or serials identify themselves, along with their product interests. A second database is built up on the first enquirers, including their identification and product interests. The second database enables book publishers to determine the identification of potential customers and of their specific product interests.