A method of a station (311, 411, 511) comprising a plurality of radio access interfaces (2111-1... 2111-N) configured for communicating over a plurality of networks using different radio access technologies, respectively, in a mobile communication system, the method comprising: receiving, from a server (313, 413, 513), information on an encoding bit rate which is used for encoding streaming service data; controlling at least two of the plurality of radio access interfaces for receiving, from the server, the streaming service data, using the at least one of the plurality of radio access interfaces; monitoring network speed corresponding to each of the at least one of the plurality of radio access interfaces while receiving the streaming service data, wherein the network speed is determined based on an amount of the streaming service data received over time through the respective radio access interface; and if a monitored network speed of one or more of the at least one of the plurality of radio access interfaces is less than a fist threshold network speed: requesting the server to transmit at least part of the streaming service data through a first network corresponding to a first of the radio access interfaces on behalf of a second network corresponding to a second of the radio access interfaces, a network speed corresponding the first radio access interface being equal to or greater than the first threshold network speed, a network speed corresponding to the second radio access interface being less than the first threshold network speed; and controlling the first radio access interface and the second radio access interface to receive the at least part of the streaming service data through the first radio access interface on behalf of the second radio access interface, wherein the first threshold network speed is determined based on the encoding bit rate. receiving, from a server (313, 413, 513), information on an encoding bit rate which is used for encoding streaming service data; controlling at least two of the plurality of radio access interfaces for receiving, from the server, the streaming service data, using the at least one of the plurality of radio access interfaces; monitoring network speed corresponding to each of the at least one of the plurality of radio access interfaces while receiving the streaming service data, wherein the network speed is determined based on an amount of the streaming service data received over time through the respective radio access interface; and if a monitored network speed of one or more of the at least one of the plurality of radio access interfaces is less than a fist threshold network speed: requesting the server to transmit at least part of the streaming service data through a first network corresponding to a first of the radio access interfaces on behalf of a second network corresponding to a second of the radio access interfaces, a network speed corresponding the first radio access interface being equal to or greater than the first threshold network speed, a network speed corresponding to the second radio access interface being less than the first threshold network speed; and controlling the first radio access interface and the second radio access interface to receive the at least part of the streaming service data through the first radio access interface on behalf of the second radio access interface, requesting the server to transmit at least part of the streaming service data through a first network corresponding to a first of the radio access interfaces on behalf of a second network corresponding to a second of the radio access interfaces, a network speed corresponding the first radio access interface being equal to or greater than the first threshold network speed, a network speed corresponding to the second radio access interface being less than the first threshold network speed; and controlling the first radio access interface and the second radio access interface to receive the at least part of the streaming service data through the first radio access interface on behalf of the second radio access interface, wherein the first threshold network speed is determined based on the encoding bit rate.