An acoustic processing device includes a circuit and a memory. Using the memory, the circuit: obtains sound space information on a sound space; obtains a sound volume ratio between a sound volume of a direct sound and a sound volume of a reflected sound, the direct sound being generated from a sound source in the sound space, the reflected sound being generated in the sound space in response to the direct sound; obtains information on additional processing; and controls whether to select the reflected sound, based on the information on the additional processing and the sound volume ratio.