A transmitter for transmitting broadcasting data, the transmitter comprising: a BCH encoder (702-L1) configured to BCH encode Layer 1 signaling data; a LDPC encoder (702-L1) configured to LDPC-encode the BCH-encoded Layer 1 signaling data to generate at least one LDPC parity bit; a puncturing means configured to perform puncturing on the generated LDPC parity bit; a bit interleaver (703-L1) configured to bit interleave the LDPC-encoded Layer 1 signaling data which the puncturing is performed on; and a QAM mapper (704-L1) configured to demultiplex the bit interleaved Layer 1 signaling data into cell words and map the cell words into constellation values; a header module (705-L1) configured to form an L1 header; a preamble mapper (707-L1) configured to generate a preamble block based on the L1 header and the constellation-mapped Layer 1 signaling data; a time-interleaver (1008-L1) configured to time-interleave the constellation-mapped Layer 1 signaling data with a time interleaving depth; a frequency-interleaver (709-L1) configured to frequency-interleave the time-interleaved Layer 1 signaling data; a frame builder configured to build a signal frame including the frequency-interleaved Layer 1 signaling data; a modulator configured to modulate the signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method; and means for transmitting the modulated signal frame, characterized in that wherein the Layer 1 signaling data include Data_Slice_num_PLP information indicating a number of PLPs carried within an associated data slice, the data slice being a group of OFDM cells carrying at least one PLP in a certain frequency sub-band, and wherein the Layer 1 signaling data include a notch start information field indicating a start position of an associated notch band and a notch width information field indicating a width of the associated notch band within a bonded channel. a BCH encoder (702-L1) configured to BCH encode Layer 1 signaling data; a LDPC encoder (702-L1) configured to LDPC-encode the BCH-encoded Layer 1 signaling data to generate at least one LDPC parity bit; a puncturing means configured to perform puncturing on the generated LDPC parity bit; a bit interleaver (703-L1) configured to bit interleave the LDPC-encoded Layer 1 signaling data which the puncturing is performed on; and a QAM mapper (704-L1) configured to demultiplex the bit interleaved Layer 1 signaling data into cell words and map the cell words into constellation values; a header module (705-L1) configured to form an L1 header; a preamble mapper (707-L1) configured to generate a preamble block based on the L1 header and the constellation-mapped Layer 1 signaling data; a time-interleaver (1008-L1) configured to time-interleave the constellation-mapped Layer 1 signaling data with a time interleaving depth; a frequency-interleaver (709-L1) configured to frequency-interleave the time-interleaved Layer 1 signaling data; a frame builder configured to build a signal frame including the frequency-interleaved Layer 1 signaling data; a modulator configured to modulate the signal frame by an Orthogonal Frequency Division Multiplexing (OFDM) method; and means for transmitting the modulated signal frame, characterized in that wherein the Layer 1 signaling data include Data_Slice_num_PLP information indicating a number of PLPs carried within an associated data slice, the data slice being a group of OFDM cells carrying at least one PLP in a certain frequency sub-band, and wherein the Layer 1 signaling data include a notch start information field indicating a start position of an associated notch band and a notch width information field indicating a width of the associated notch band within a bonded channel.