To provide practical technology for using the incoming tone of a mobile phone or the like for advertisements.

An advertising method comprises a step for discriminating whether a second client is an advertisement contracted person or not in response to a call from a first client terminal to a second client terminal, a step for holding a lottery related to a contracted advertisement in the case of the second client being a sponsor, a step for transmitting information for outputting a tone related to a winning advertisement to the second client terminal and a ringing tone to the second client terminal in the case of winning in the lottery, a step for sending data including a quiz related to the winning advertisement to the second client terminal when the end of speech is detected between the first client terminal and the second client terminal, a step for discriminating whether an answer to the quiz is correct or not when answer information to the quiz is received from the second client terminal, and a step for registering incentive information about the winning advertisement for the second client in the case of a correct answer.

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