A transmission method comprising: mapping processing including generating from sequentially input data a plurality N of first modulated signals s1 and a plurality of second modulated signals s2 using a first mapping scheme, the number of the generated plurality of second modulated signals s2 being equal to the number of the generated plurality of first modulated signals s1, and generating from said sequentially input data a plurality N of third modulated signals s3 and a plurality of fourth modulated signals s4 using a second mapping scheme, the number of the generated plurality of fourth modulated signals s4 being equal to the number of the generated plurality of third modulated signals s3, each of the first mapping scheme and the second mapping scheme involving 16 signal points, the first mapping scheme and the second mapping scheme being different from each other in a signal point arrangement; phase change processing including performing a phase change on the plurality of second modulated signals s2 using sequentially all N kinds of phases, and performing the phase change on the plurality of fourth modulated signals s4 using sequentially all the N kinds of phases, the N being an integer of 2 or more; and transmission processing including transmitting sequentially the plurality of first modulated signals s1 and the plurality of third modulated signals s3 using a first antenna, transmitting each of the plurality of second modulated signals s2 subjected to the phase change using a second antenna at a same frequency and a same time as a frequency and a time of a corresponding one of the plurality of first modulated signals s1, and transmitting each of the plurality of fourth modulated signals s4 subjected to the phase change using the second antenna at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of third modulated signals s3. mapping processing including generating from sequentially input data a plurality N of first modulated signals s1 and a plurality of second modulated signals s2 using a first mapping scheme, the number of the generated plurality of second modulated signals s2 being equal to the number of the generated plurality of first modulated signals s1, and generating from said sequentially input data a plurality N of third modulated signals s3 and a plurality of fourth modulated signals s4 using a second mapping scheme, the number of the generated plurality of fourth modulated signals s4 being equal to the number of the generated plurality of third modulated signals s3, each of the first mapping scheme and the second mapping scheme involving 16 signal points, the first mapping scheme and the second mapping scheme being different from each other in a signal point arrangement; phase change processing including performing a phase change on the plurality of second modulated signals s2 using sequentially all N kinds of phases, and performing the phase change on the plurality of fourth modulated signals s4 using sequentially all the N kinds of phases, the N being an integer of 2 or more; and transmission processing including transmitting sequentially the plurality of first modulated signals s1 and the plurality of third modulated signals s3 using a first antenna, transmitting each of the plurality of second modulated signals s2 subjected to the phase change using a second antenna at a same frequency and a same time as a frequency and a time of a corresponding one of the plurality of first modulated signals s1, and transmitting each of the plurality of fourth modulated signals s4 subjected to the phase change using the second antenna at a same frequency and a same time as a frequency and a time of a corresponding modulated signal of the plurality of third modulated signals s3.