TRANSMITTING DEVICE AND TRANSMITTING METHOD, RECEIVING DEVICE AND RECEIVING METHOD AND, TRANSMITTING AND RECEIVING SYSTEM AND TRANSMITTING AND RECEIVING METHOD

摘要

PROBLEM TO BE SOLVED: To make selectively obtainable the necessary difference update information of a directory structure, and to make efficiently performable the change of a leaf entry based on the difference update information. SOLUTION: On the transmission side 1, the change of a directory structure managed by a server 11 is detected by a replecator 12, and the difference update information of container and leaf hierarchies are respectively generated. The difference update information of the leaf hierarchies is broadcast with the ID list of difference update information which should be already processed at the time of operating the update processing of the directory structure based on the difference update information at the reception side. On the reception side 3, the list of the ID of the difference update information which is processed by its own side is referred to, and when any ID which is not present in the list is present in the received ID list of the difference update information which should be already processed, the difference update information of the ID is requested to the transmission side 1 in a prescribed communicating method. On the transmission side 1, the difference update information is transmitted to the reception side 3 according to the request.