A dual-task performing ability evaluation method includes a dual task step (S201), an analysis step (S401), and an evaluation step (S601). In the dual task step (S201), a subject performs a dual task including a movement task that requires the subject to perform specific movement and an intelligence task that requires the subject to answer a specific problem. Further, at least one of motion and an answer of the subject performing the dual task is detected. In the analysis step (S401), the at least one of the motion and the answer that has been detected is analyzed. In the evaluation step (S601), dual-task performing ability of the subject is evaluated based on a result of the analysis.
