A method and associated apparatus/system for controlling access to data in a database. A first login by a first user is accepted. A second login by the first user under the name of a second user is accepted. Third data is referred, based on first data of the database accessible from the first user and second data of the database accessible from the second user, upon request to refer to the database under the name of the first user or the second user after the first login and the second login are accepted.