The present art relates to a signal processing device, method, and program capable of improving encoding efficiency. The signal processing device comprises: an acquisition unit for acquiring reverb information including at least one of space reverb information inherent in a space around an audio object and object reverb information inherent in the audio object, and an audio object signal of the audio object; and a reverb processing unit for producing a signal of a reverb component of the audio object on the basis of the reverb information and the audio object signal. The present art is applicable to the signal processing device.