An apparatus for generating a broadcast signal frame, comprising: an injection level controller configured to generate a power-reduced enhanced layer signal by reducing power of an enhanced layer signal; a combiner configured to generate a multiplexed signal by super-imposing a core layer signal and the power-reduced enhanced layer signal; a power normalizer configured to generate a power-reduced multiplexed signal by reducing power of the multiplexed signal to a power level corresponding to the core layer signal using a normalizing factor which is applied to both the core layer signal and the power-reduced enhanced layer signal in the multiplexed signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both a core layer corresponding to the core layer signal and an enhanced layer corresponding to the enhanced layer signal of the power-reduced multiplexed signal after combining the core layer signal and the power-reduced enhanced layer signal; and a frame builder configured to generate a broadcast signal frame by using the time-interleaved signal, the broadcast signal frame including a preamble for signaling start position information of Physical Layer Pipes and time interleaver information shared by the core layer signal and the enhanced layer signal, the Physical Layer Pipes used for delivering data of the broadcast signal frame, the physical layer pipes including at least one core layer data physical layer pipe corresponding to the core layer and at least one enhanced layer data Physical Layer Pipe corresponding to the enhanced layer, wherein the time interleaver is shared for both the core layer and the enhanced layer, wherein the start position information is identical to an index corresponding to a first data cell of a Physical Layer Pipe, wherein the start position information is included in the preamble for each of the physical layer pipes. an injection level controller configured to generate a power-reduced enhanced layer signal by reducing power of an enhanced layer signal; a combiner configured to generate a multiplexed signal by super-imposing a core layer signal and the power-reduced enhanced layer signal; a power normalizer configured to generate a power-reduced multiplexed signal by reducing power of the multiplexed signal to a power level corresponding to the core layer signal using a normalizing factor which is applied to both the core layer signal and the power-reduced enhanced layer signal in the multiplexed signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both a core layer corresponding to the core layer signal and an enhanced layer corresponding to the enhanced layer signal of the power-reduced multiplexed signal after combining the core layer signal and the power-reduced enhanced layer signal; and a frame builder configured to generate a broadcast signal frame by using the time-interleaved signal, the broadcast signal frame including a preamble for signaling start position information of Physical Layer Pipes and time interleaver information shared by the core layer signal and the enhanced layer signal, the Physical Layer Pipes used for delivering data of the broadcast signal frame, the physical layer pipes including at least one core layer data physical layer pipe corresponding to the core layer and at least one enhanced layer data Physical Layer Pipe corresponding to the enhanced layer, wherein the time interleaver is shared for both the core layer and the enhanced layer, wherein the start position information is identical to an index corresponding to a first data cell of a Physical Layer Pipe, wherein the start position information is included in the preamble for each of the physical layer pipes.