1. A data management device comprising: a search condition information storage portion storing one or more pieces of search condition information, each piece of the search condition information indicating a search condition; a data retrieval portion retrieving, from a storage medium, when a piece of the search condition information is designated, data satisfying the search condition indicated in the piece of the search condition information; and a search condition information adding portion causing, when a new search condition is designated by a user and the new search condition does not match any of the search conditions indicated in any pieces of the search condition information, the search condition information storage portion to store a piece of information indicating the new search condition as one piece of the search condition information.