TRANSMITTER AND ITS TRANSMITTING METHOD, RECEIVER AND ITS RECEIVING METHOD, AND TRANSMITTER-RECEIVER AND ITS TRANSMITTING/RECEIVING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a directory service of good quality based on a lightweight directory access protocol(LDAP) to many clients. SOLUTION: When a directory entry in a data base 32 is updated, a transmitting side duplicate synchronization management module 33 files a subject for executing the updating by an LDAP data interchange format(LDIF) file and transmits the filed subject through a broadcasting network 4 capable of simultaneously broadcasting information. An event for informing of the updating of the directory entry in which acquisition information for acquiring the subject is arranged, is also transmitted through the network 4. A receiving side duplicate synchronization management module 41 receives the event and receives the subject based on the acquisition information included in the event. Further, the module 41 updates a data base 42 by using the subject.