[Problem] To objectively evaluate online communications, which have become mainstream, in order to carry out communication more efficiently. [Solution] A system according to the present disclosure comprising: a video acquisition unit that acquires video obtained by imaging each of a plurality of users during an online session; a parsing unit that parses changes in biological reactions of the users on the basis of the video acquired by the video acquisition unit; an analysis unit that extracts behavioral feature quantities of the users from the parsed changes in biological reactions; a storage unit that stores the behavioral feature quantities in association with the users; a verification unit that verifies whether a person included in an input verification video is a user or not by using the behavior feature quantities and the changes in biological reactions pertaining to the verification video; and a verification result output unit that outputs the verification result.