Receiving apparatus, transmitting apparatus, communication system and method of detecting buffer setting of relay server

摘要

A receiving apparatus of the present invention includes: a relayed dummy data receiving unit for receiving relayed dummy data including dummy data of n bytes (n ‰¥ 1) and/or dummy data of N bytes (N ‰¥ n) sequentially and repetitively transmitted from a transmitting apparatus to a relay server from the relay server; and a buffer setting detecting unit for detecting a buffer setting of the relay server based on a first size value indicative of data size of relayed dummy data received for the first time by the relayed dummy data receiving unit and a second size value indicative of not larger data size of relayed dummy data received for the second time and relayed dummy data received for the third time.