A transmission apparatus that transmits a block signal including a plurality of data symbols, the transmission apparatus comprising: a data-symbol generation unit that generates data symbols; a symbol arrangement unit that generates two or more same-quadrant symbols that become signal points in a same quadrant in a complex plane and arranges the data symbols and the same-quadrant symbols in a time domain such that the two or more same-quadrant symbols are inserted at predetermined positions in a block signal to generate a block symbol, wherein the same-quadrant symbols are used for each block signal of one frame; an interpolation unit that performs interpolation processing on the block symbol; and a CP insertion unit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal; wherein the symbol arrangement unit arranges one out of the same-quadrant symbols at a head of a symbol to be copied as a Cyclic Prefix and one further out of the same-quadrant symbols at a head of the block symbol, the interpolation unit performs the interpolation processing such that an interpolated point that has been interpolated between a last symbol of the block symbol and a head symbol of the block symbol is added behind the last symbol, the interpolation unit includes a Fourier transform unit that performs a Fourier transform on the block symbol, wherein the number N D of data points at which the Fourier transform is performed by the Fourier transform unit is larger than the number N of symbols in the block symbol, a zero insertion unit that performs zero insertion on data on which the Fourier-transform has been performed, wherein the output s of the DFT unit is divided into two parts and the zero insertion unit is configured to insert N(L-1)+N-N D zeroes into the middle between s ND/2-1 and s ND /2 and L being an oversampling factor, and an inverse Fourier transform unit that performs an inverse Fourier transform on data on which the zero insertion has been performed; the predetermined positions are a first position that is a head of the block symbol and a second position that is a head of the symbol to be copied as a Cyclic Prefix, the symbol arrangement unit generates a symbol series that includes a plurality of symbols including the same-quadrant symbols, the symbol series includes a first symbol group before a first symbol position and a second symbol group after the first symbol position, and the symbol arrangement unit arranges the second symbol group such that the first and second positions become a head of the second symbol group, and arranges the first symbol group such that a last symbol of the block symbol and a symbol that is one before the second position become a last symbol of the first symbol group. a data-symbol generation unit that generates data symbols; a symbol arrangement unit that generates two or more same-quadrant symbols that become signal points in a same quadrant in a complex plane and arranges the data symbols and the same-quadrant symbols in a time domain such that the two or more same-quadrant symbols are inserted at predetermined positions in a block signal to generate a block symbol, wherein the same-quadrant symbols are used for each block signal of one frame; an interpolation unit that performs interpolation processing on the block symbol; and a CP insertion unit that inserts a Cyclic Prefix into a signal on which the interpolation processing has been performed to generate the block signal; wherein the symbol arrangement unit arranges one out of the same-quadrant symbols at a head of a symbol to be copied as a Cyclic Prefix and one further out of the same-quadrant symbols at a head of the block symbol, the interpolation unit performs the interpolation processing such that an interpolated point that has been interpolated between a last symbol of the block symbol and a head symbol of the block symbol is added behind the last symbol, the interpolation unit includes a Fourier transform unit that performs a Fourier transform on the block symbol, wherein the number N D of data points at which the Fourier transform is performed by the Fourier transform unit is larger than the number N of symbols in the block symbol, a zero insertion unit that performs zero insertion on data on which the Fourier-transform has been performed, wherein the output s of the DFT unit is divided into two parts and the zero insertion unit is configured to insert N(L-1)+N-N D zeroes into the middle between s ND/2-1 and s ND /2 and L being an oversampling factor, and an inverse Fourier transform unit that performs an inverse Fourier transform on data on which the zero insertion has been performed; the predetermined positions are a first position that is a head of the block symbol and a second position that is a head of the symbol to be copied as a Cyclic Prefix, the symbol arrangement unit generates a symbol series that includes a plurality of symbols including the same-quadrant symbols, the symbol series includes a first symbol group before a first symbol position and a second symbol group after the first symbol position, and the symbol arrangement unit arranges the second symbol group such that the first and second positions become a head of the second symbol group, and arranges the first symbol group such that a last symbol of the block symbol and a symbol that is one before the second position become a last symbol of the first symbol group.