Abstract: Disclosed is a natural language processing (NLP)-based personality assessment device. The personality assessment device includes a questionnaire providing unit configured to transmit, to a terminal, a message that includes a plurality of interview questions and at least one directive sentence and to receive, from the terminal, a first response to each of the plurality of interview questions and a second response to the at least one directive sentence; a preprocessing unit configured to preprocess at least one of the first response and the second response; and a personality prediction unit configured to predict personality of a user of the terminal using a preprocessing result by the preprocessing unit.