A speech processing apparatus includes a specifier, a determiner, and a modulator. The specifier specifies an emphasis part of speech to be output. The determiner determines, from among a plurality of output units, a first output unit and a second output unit for outputting speech for emphasizing the emphasis part. The modulator modulates the emphasis part of at least one of first speech to be output to the first output unit and second speech to be output to the second output unit such that at least one of a pitch and a phase is different between the emphasis part of the first speech and the emphasis part of the second speech.