A transmitting apparatus 100 operates a high-frequency power amplifier 105 as a nonlinear amplifier in a first mode, and operates high-frequency power amplifier 105 as a linear amplifier in a second mode. When high-frequency power amplifier 105 is operated as a nonlinear amplifier, the input level of high-frequency power amplifier 105 is varied by a variable gain amplifier 107 in accordance with the average output power of a transmit signal. Transmitting apparatus 100 is also provided with a compensation table 121 for reducing error in high-frequency power amplifier 105 mode switching operations.