PROBLEM TO BE SOLVED: To accurately estimate an impression of a stimulation that can be sensed with one of the five senses.SOLUTION: This device estimates a first feature amount string including plural first feature amount based on the dynamic variation in the eyes of an animal that is given a first stimulation and a second feature amount string including plural second feature amounts based on the movement of the eyes of the animal that is not given the first stimulation, and estimates at least the animals impression of the first stimulation on the basis of information including a comparison feature amount string based on a string having, as respective elements, values expressing a comparison result between the respective elements of the first feature amount string and those of the second feature amount string.SELECTED DRAWING: Figure 1
