PROBLEM TO BE SOLVED: To satisfy a conventional demand to implement audience extension for a user who visits a certain website or a user who enters a certain search keyword in real time.;SOLUTION: A posterior probability calculation device 1 includes: user information storage means 101 storing user information for making each user attribute correspond to history information; prior probability calculation means 103 calculating a prior probability that is a probability that a user has a given attribute; likelihood calculation means 104 calculating a likelihood that is a probability that the user having the given user attribute held a given event; receiving means 105 receiving calculation target information; posterior probability calculation means 106 calculating a posterior probability that is a probability that the user who held the event included in the history information included in the calculation target information received by the receiving means 105 has the user attribute included in the calculation target information; and output means 108 outputting an indication relating to the posterior probability. The posterior probability calculation device 1 configured in this way can acquire the posterior probability in a short time.;COPYRIGHT: (C)2015,JPO&INPIT
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