| 摘要 |
PROBLEM TO BE SOLVED: To properly evaluate advertisement.SOLUTION: An advertisement evaluation calculation unit 232 counts, for advertisement, the number of impression logs corresponding to the advertisement from an impression log storage unit 253, to define it as the number of displays; counts the number of click logs corresponding to the advertisement from a click log storage unit 254 to define it as the number of clicks; divides a value obtained by adding 1 to the number of actions by a value obtained by adding 2 to the number of displays to calculate an expectation value xCTR of a probability that the advertisement may be clicked; and defines the xCTR or a value obtained by multiplying a bidding amount to xCTR, as an evaluation value of the advertisement. |
