A communication terminal performing Fourier transform to convert a first time-domain signal into frequency-domain signals, allocating the frequency-domain signals to one or more first block is composed of two or more contiguous subcarriers as a first allocation unit, performing inverse Fourier transform to convert the allocated frequency-domain signals into a second time-domain signal, and transmitting, to a BS, the second time-domain signal simultaneously with another communication terminal, in case that the other communication apparatus performs communication with the BS using one or more second block composed of two or more contiguous subcarriers as a second allocation unit wherein the second block, wherein the number of subcarriers of the second block is equal to a value of x multiplied by the number of subcarriers of the first block, and x is equal to a value of 2 or a value greater than 2.