A signal processing apparatus, wherein the signal processing apparatus comprises a power amplification module, a processing module connected to the power amplification module, and a communication module connected to the processing module; and the power amplification module comprises a first power amplifier and a second power amplifier, and the processing module comprises a first filter unit connected to the first power amplifier, a second filter unit connected to the second power amplifier, and a combiner unit connected to the first filter unit, the second filter unit, and the communication module; the first power amplifier is configured to: perform power amplification on a received first signal, to obtain a second signal, and send the second signal to the first filter unit, wherein the first signal comprises a signal belonging to a first frequency band and a signal belonging to a second frequency band; the first filter unit is configured to: receive the second signal sent by the first power amplifier, and filter the second signal, to obtain a first sub-signal and a second sub-signal, wherein the first sub-signal belongs to the first frequency band, and the second sub-signal belongs to the second frequency band; the second power amplifier is configured to: perform power amplification on a received third signal, to obtain a fourth signal, and send the fourth signal to the second filter unit, wherein the third signal comprises at least a signal belonging to a third frequency band; the second filter unit is configured to: receive the fourth signal sent by the second power amplifier, and filter the fourth signal, to obtain n sub-signals, wherein the n sub-signals comprise at least a third sub-signal, the third sub-signal belongs to the third frequency band, and n is an integer greater than or equal to 1; the combiner unit is configured to: combine the first sub-signal and i sub-signals in the n sub-signals based on a preset condition, to obtain a first combined signal, and send the first combined signal and the second sub-signal to the communication module, wherein 1≤i≤n, and i is an integer, and the preset condition is to combine signals whose frequency band difference is greater than or equal to a preset threshold, or to combine a signal belonging to a first preset frequency band and a signal belonging to a second preset frequency band, said second preset frequency band being different from said first preset frequency band and the communication module is configured to: send the first combined signal by using a first port, and send the second sub-signal by using a second port. the first power amplifier is configured to: perform power amplification on a received first signal, to obtain a second signal, and send the second signal to the first filter unit, wherein the first signal comprises a signal belonging to a first frequency band and a signal belonging to a second frequency band; the first filter unit is configured to: receive the second signal sent by the first power amplifier, and filter the second signal, to obtain a first sub-signal and a second sub-signal, wherein the first sub-signal belongs to the first frequency band, and the second sub-signal belongs to the second frequency band; the second power amplifier is configured to: perform power amplification on a received third signal, to obtain a fourth signal, and send the fourth signal to the second filter unit, wherein the third signal comprises at least a signal belonging to a third frequency band; the second filter unit is configured to: receive the fourth signal sent by the second power amplifier, and filter the fourth signal, to obtain n sub-signals, wherein the n sub-signals comprise at least a third sub-signal, the third sub-signal belongs to the third frequency band, and n is an integer greater than or equal to 1; the combiner unit is configured to: combine the first sub-signal and i sub-signals in the n sub-signals based on a preset condition, to obtain a first combined signal, and send the first combined signal and the second sub-signal to the communication module, wherein 1≤i≤n, and i is an integer, and the preset condition is to combine signals whose frequency band difference is greater than or equal to a preset threshold, or to combine a signal belonging to a first preset frequency band and a signal belonging to a second preset frequency band, said second preset frequency band being different from said first preset frequency band and the communication module is configured to: send the first combined signal by using a first port, and send the second sub-signal by using a second port.