Included are a data-symbol generation unit 1 that generates data symbols for one block in each block; a storage and processing unit 3 that stores therein a data symbol at a first position, among the data symbols for one block, as a copied symbol; a symbol insertion unit 2 that generates a block symbol by putting the data symbols and the copied symbol such that the copied symbol stored in the storage and processing unit 3 are inserted at a second position of the data symbols for one block; a time/frequency conversion unit 5 that converts the block signal into a frequency domain signal; an interpolation unit 8 that performs interpolation processing on the frequency domain symbol; and a CP insertion unit 9 that generates the block signal by inserting a Cyclic Prefix into a signal on which the interpolation processing has been performed.