subcarriers for one group to 5 as shown in fig4 b fig5 is a resource graph for a description of a data transmission method according to further another embodiment of the present invention that is a third embodiment of the present invention uses snr characteristics in the frequency domain for the spatial mode as shown in fig5 it can be noted that when a transmitter transmits data in a spatial mode with g 1 or g 2 a variation in received snr is less and a variation in snr of each spatial channel is large for the spatial mode with g 4 fig6 is a conceptual diagram for a description of a process of selecting one of the spatial modes with g 1 and g 2 in the frequency domain according to the third embodiment of the present invention the third embodiment of the present invention selects spatial subchannels for the spatial modes 601 and 602 with g 1 and g 2 for each of a predetermined number of subcarriers selects modulation schemes for the spatial modes referring to the look up table 605 shown in table 1 sums up data rates as in summation blocks 621 and 622 for the subcarriers for the same spatial mode compares the sums of the data rates for the spatial.