An interest degree determination device detects a gaze position of a first user included in a plurality of users on the basis of image information. When a second user other than the first user is present in the vicinity of the first user, the interest degree determination device determines whether the gaze position of the first user has been affected by the second user. The interest degree determination device stores a determination result of a determination unit and the gaze position of the first user in a storage unit so as to be associated with each other.
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