The present invention relates to a device for inferring social emotion on the basis of emotion synchronization and a method therefor. According to the present invention, a method for inferring social emotion by using a device for inferring social emotion, comprises the steps of: receiving lifelogging data of a user, including at least one of biological signal measurement data, behavioral measurement data, environmental measurement data, and web content use data; generating two-dimensional emotion information according to a pleasant-unpleasant axis and an arousal-relaxation axis by time slot at preset time intervals by using the lifelogging data, wherein the two-dimensional emotion information is generated by category including at least one of biological information (H), behavioral information (B), environmental information (S), and content information (C); generating a social emotion synchronization pattern by determining whether emotion is synchronized between the user and other users, through the generated two-dimensional emotion information; and inferring social emotion of the user by comparing the generated social emotion synchronization pattern with a social emotion database. As described above, according to the present invention, social emotion is inferred by analyzing lifelogging data according to the interactions with neighboring people and an environment, and thus social emotion of an individual can be accurately inferred.
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