A rehabilitation evaluation apparatus configured to evaluate a level of recovery of a trainee by rehabilitation training, comprising: a myoelectric-signal acquisition unit configured to acquire a plurality of first myoelectric signals output from respective first myoelectric sensors attached in a plurality of places on a first-side part and a plurality of second myoelectric signals output from respective second myoelectric sensors attached in a plurality of places on a second-side part, the first-side part being located, when limbs of the trainee are divided into left and right sides, on one of the sides in which a rehabilitation-target part is included, the second-side part being located on the other of the sides in which the rehabilitation-target part is not included, the places of the second myoelectric sensors being left-right symmetric to the places of respective first myoelectric sensors with respect to the limbs; a sensor signal acquisition unit configured to acquire a sensor signal output from a detection sensor, the detection sensor being configured to detect an amount of a change in the second-side part resulting from a comparative motion corresponding to a training motion performed in the first-side part in the rehabilitation training, in which the trainee is a detection target and performs the comparative motion in the second-side part; a selection unit configured to calculate a motion frequency of the comparative motion from the sensor signal acquired by the sensor signal acquisition unit and select, as a second correlated myoelectric signal, a myoelectric signal having a predetermined strength or stronger at the motion frequency from among the plurality of second myoelectric signals acquired by the myoelectric-signal acquisition unit; and a similarity output unit configured to select, as a first correlated myoelectric signal, a first myoelectric signal that has been output from a first myoelectric sensor attached in a place that is left-right symmetric to a place of the second myoelectric sensor that has output the second correlated myoelectric signal selected by the selection unit with respect to the limbs from among the plurality of first myoelectric signals acquired by the myoelectric-signal acquisition unit, calculate a similarity between the first and second correlated myoelectric signals, and output the calculated similarity. a myoelectric-signal acquisition unit configured to acquire a plurality of first myoelectric signals output from respective first myoelectric sensors attached in a plurality of places on a first-side part and a plurality of second myoelectric signals output from respective second myoelectric sensors attached in a plurality of places on a second-side part, the first-side part being located, when limbs of the trainee are divided into left and right sides, on one of the sides in which a rehabilitation-target part is included, the second-side part being located on the other of the sides in which the rehabilitation-target part is not included, the places of the second myoelectric sensors being left-right symmetric to the places of respective first myoelectric sensors with respect to the limbs; a sensor signal acquisition unit configured to acquire a sensor signal output from a detection sensor, the detection sensor being configured to detect an amount of a change in the second-side part resulting from a comparative motion corresponding to a training motion performed in the first-side part in the rehabilitation training, in which the trainee is a detection target and performs the comparative motion in the second-side part; a selection unit configured to calculate a motion frequency of the comparative motion from the sensor signal acquired by the sensor signal acquisition unit and select, as a second correlated myoelectric signal, a myoelectric signal having a predetermined strength or stronger at the motion frequency from among the plurality of second myoelectric signals acquired by the myoelectric-signal acquisition unit; and a similarity output unit configured to select, as a first correlated myoelectric signal, a first myoelectric signal that has been output from a first myoelectric sensor attached in a place that is left-right symmetric to a place of the second myoelectric sensor that has output the second correlated myoelectric signal selected by the selection unit with respect to the limbs from among the plurality of first myoelectric signals acquired by the myoelectric-signal acquisition unit, calculate a similarity between the first and second correlated myoelectric signals, and output the calculated similarity.