A transmission method for broadcast or multicast communications, comprising: applying precoding to a first modulated signal s1 and a second modulated signal s2 to generate a first precoded signal z'1 and a second precoded signal z'2, the first modulated signal s1 having been modulated by a first modulation scheme having a first number of signal points in the I-Q plane denoted by a, the second modulated signal s2 having been modulated by a second modulation scheme having a second number of signal points in the I-Q plane denoted by b, and a and b being integers satisfying a < b; performing a phase change on at least one of the first precoded signal z'1 and the second precoded signal z'2 to generate a first transmission signal z1 and a second transmission signal z2; and transmitting the first transmission signal z1 and the second transmission signal z2 respectively from a first antenna and a second antenna at the same time at the same frequency, the precoding being represented by a precoding matrix F = 1 α 2 + 1 e j 0 α × e jo α × e j 0 e jπ where α is equal to 1, wherein the phase change is performed on the basis of a predetermined phase changing pattern having a predetermined period, and the transmission method further comprising: performing a power change involving multiplication of the first modulated signal s1 by a weighting factor u a and multiplication the second modulated signal s2 by a weighting factor u b, the weighting factor u a being used for the generation of the first transmission signal z1 from the first modulated signal s1, the weighting factor u b being used for the generation of the second transmission signal z2 from the second modulated signal s2, and the weighting factor u a and the weighting factor u b satisfying u a < u b. applying precoding to a first modulated signal s1 and a second modulated signal s2 to generate a first precoded signal z'1 and a second precoded signal z'2, the first modulated signal s1 having been modulated by a first modulation scheme having a first number of signal points in the I-Q plane denoted by a, the second modulated signal s2 having been modulated by a second modulation scheme having a second number of signal points in the I-Q plane denoted by b, and a and b being integers satisfying a < b; performing a phase change on at least one of the first precoded signal z'1 and the second precoded signal z'2 to generate a first transmission signal z1 and a second transmission signal z2; and transmitting the first transmission signal z1 and the second transmission signal z2 respectively from a first antenna and a second antenna at the same time at the same frequency, the precoding being represented by a precoding matrix F = 1 α 2 + 1 e j 0 α × e jo α × e j 0 e jπ where α is equal to 1, wherein the phase change is performed on the basis of a predetermined phase changing pattern having a predetermined period, and the transmission method further comprising: performing a power change involving multiplication of the first modulated signal s1 by a weighting factor u a and multiplication the second modulated signal s2 by a weighting factor u b, the weighting factor u a being used for the generation of the first transmission signal z1 from the first modulated signal s1, the weighting factor u b being used for the generation of the second transmission signal z2 from the second modulated signal s2, and the weighting factor u a and the weighting factor u b satisfying u a < u b.