A reception apparatus, comprising: a plurality of demodulation units each associated with a respective antenna of a plurality of antennas, wherein each demodulation unit demodulates a signal supplied by its respective antenna and generates a symbol; a synthesis unit that synthesizes the symbols demodulated in the plurality of demodulation units and generates a synthesis symbol; an error correction unit that performs error correction of the synthesis symbol; and a smoothing unit that controls a transmission rate of the synthesis symbol from the synthesis unit to the error correction unit to fall within a certain range, wherein the smoothing unit includes a buffer unit that holds the synthesis symbol from the synthesis unit, an input-time estimation unit that estimates a time at which the synthesis symbol is input from the synthesis unit to the smoothing unit, wherein the input-time estimation unit sets a transmission rate at an output start of the synthesis symbol to the error correction unit by a parameter supplied from the demodulation unit, and an output-time generation unit that generates a time at which the synthesis symbol held in the buffer unit is output to the error correction unit, wherein the output-time generation unit generates a time at which the synthesis symbol is output by using an estimated input interval that is estimated by the input-time estimation unit, the estimated input time at which the synthesis symbol is input, and a set predetermined time period. a plurality of demodulation units each associated with a respective antenna of a plurality of antennas, wherein each demodulation unit demodulates a signal supplied by its respective antenna and generates a symbol; a synthesis unit that synthesizes the symbols demodulated in the plurality of demodulation units and generates a synthesis symbol; an error correction unit that performs error correction of the synthesis symbol; and a smoothing unit that controls a transmission rate of the synthesis symbol from the synthesis unit to the error correction unit to fall within a certain range, wherein the smoothing unit includes a buffer unit that holds the synthesis symbol from the synthesis unit, an input-time estimation unit that estimates a time at which the synthesis symbol is input from the synthesis unit to the smoothing unit, wherein the input-time estimation unit sets a transmission rate at an output start of the synthesis symbol to the error correction unit by a parameter supplied from the demodulation unit, and an output-time generation unit that generates a time at which the synthesis symbol held in the buffer unit is output to the error correction unit, wherein the output-time generation unit generates a time at which the synthesis symbol is output by using an estimated input interval that is estimated by the input-time estimation unit, the estimated input time at which the synthesis symbol is input, and a set predetermined time period. a buffer unit that holds the synthesis symbol from the synthesis unit, an input-time estimation unit that estimates a time at which the synthesis symbol is input from the synthesis unit to the smoothing unit, wherein the input-time estimation unit sets a transmission rate at an output start of the synthesis symbol to the error correction unit by a parameter supplied from the demodulation unit, and an output-time generation unit that generates a time at which the synthesis symbol held in the buffer unit is output to the error correction unit, wherein the output-time generation unit generates a time at which the synthesis symbol is output by using an estimated input interval that is estimated by the input-time estimation unit, the estimated input time at which the synthesis symbol is input, and a set predetermined time period.