INFLUENCER EXTRACTION DEVICE, INFLUENCER EXTRACTION METHOD AND PROGRAM

PROBLEM TO BE SOLVED: To extract a user who transmits broadly-propagating writing information, as an influencer in social media.SOLUTION: An influencer extraction device 100 comprises: an information acquisition part 110 for acquiring writing information including retransmission-related information, from social media; a user information acquisition part 120 for acquiring the link number of each user from the social media; a reply frequency acquisition part 130 for acquiring a reply frequency between linked users, from the social media; a diffusion rate calculation part 140 for calculating a diffusion rate based on the retransmission-related information; a revealing degree calculation part 150 for calculating a reveling degree between users based on the reply frequency; a propagation degree analysis part 160 for calculating a propagation degree of each writing information based on the link number of the user, the diffusion rate and the revealing degree; and an extraction part 170 for calculating user's influence from the propagation degree of the writing information, and extracting an influential user as an influencer.