A satellite transmitter, comprising: K transmission antenna elements (15a-15d) configured to emit transmission beams each having a different frequency from each other to any of one or more points on ground based on each of K analog signals; a multiplexing unit (12a-12d) configured to multiplex, by using K digital signals of a frequency domain demultiplexed for each frequency as inputs, each of the K digital signals on a frequency axis and then convert the multiplexed digital signals to time-domain digital signals, the number K corresponding to the number of the transmission antenna elements (15a-15d); a digital-to-analog converter (13a-13d) configured to convert each of the K digital signals to the analog signal; a storage device configured to store K excitation coefficients for forming the transmission beams as beam-formation excitation coefficients; a PAPR calculation unit configured to calculate, as a PAPR, a peak-to-average power ratio for each of the K digital signals converted by the multiplexing unit (12a-12d); a beam-to-beam relative phase calculation unit configured to calculate a beam-to-beam relative phase for suppressing a peak power of the transmission antenna elements (15a-15d) based on the K PAPRs; an excitation coefficient calculation unit configured to calculate K updated excitation coefficients based on the beam-to-beam relative phase and the beam-formation excitation coefficients; and an excitation coefficient multiplication unit (11a-11d) configured to generate the digital signals of the frequency domain to be output to the multiplexing unit (12a-12d) by multiplying a received relay signal by each of the K updated excitation coefficients in the frequency domain, wherein K is an integer larger than 1. K transmission antenna elements (15a-15d) configured to emit transmission beams each having a different frequency from each other to any of one or more points on ground based on each of K analog signals; a multiplexing unit (12a-12d) configured to multiplex, by using K digital signals of a frequency domain demultiplexed for each frequency as inputs, each of the K digital signals on a frequency axis and then convert the multiplexed digital signals to time-domain digital signals, the number K corresponding to the number of the transmission antenna elements (15a-15d); a digital-to-analog converter (13a-13d) configured to convert each of the K digital signals to the analog signal; a storage device configured to store K excitation coefficients for forming the transmission beams as beam-formation excitation coefficients; a PAPR calculation unit configured to calculate, as a PAPR, a peak-to-average power ratio for each of the K digital signals converted by the multiplexing unit (12a-12d); a beam-to-beam relative phase calculation unit configured to calculate a beam-to-beam relative phase for suppressing a peak power of the transmission antenna elements (15a-15d) based on the K PAPRs; an excitation coefficient calculation unit configured to calculate K updated excitation coefficients based on the beam-to-beam relative phase and the beam-formation excitation coefficients; and an excitation coefficient multiplication unit (11a-11d) configured to generate the digital signals of the frequency domain to be output to the multiplexing unit (12a-12d) by multiplying a received relay signal by each of the K updated excitation coefficients in the frequency domain, wherein K is an integer larger than 1.