A database management system (DBMS) is configured to delete, from a database storing information about time points associated with records, a record indicating a lapse of a predetermined time period since a time point indicated by associated information. The DBMS receives a remaining condition which indicates a time period during which a record is kept in the database regardless of the predetermined time period, and controls to keep a record in the database even after a lapse of the predetermined time period, based on the remaining condition.