The present application relates to a client device, a method for receiving a streaming media data and a streaming media data transmission system. In the client device, a transceiver transmits a request for a segment to a server and receives the segment transmitted from the servers. If it is determined by a processor that the transceiver does not receive a first segment transmitted from the server within the preset threshold time from transmitting the request for the first segment to the server, the processor controls the transceiver to transmit a request for a second segment having the same media content and a lower transmission bit rate to the server.