Estimation device, estimation method, and recording medium

An estimation device comprising:

• a microphone, a display, and a processor configured to perform operations comprising:
• instructing a speaker to repetitively utter two syllables containing both of (i) a sound including a velar plosive in a consonant or a sound including an alveolar fricative in a consonant, and (ii) a sound including an alveolar plosive in a consonant;
• obtaining, via the microphone, a voice of the speaker;
• analyzing a voice feature of the voice obtained, and estimating an oral function of the speaker based on the voice feature analyzed;
• and
• presenting, via the display, a condition of the oral function of the speaker which has been estimated, wherein
• the instructing includes instructing the speaker to repetitively utter the two syllables at a speed at which the two syllables are uttered twice in one second.