Abstract: A question and answer processing device receives question information, purchase history requirement information, and attribute requirement information from a questioner terminal device, acquires user identification information which has been searched for by a search means that searches for the user identification information of a user satisfying requirements indicated by the received purchase history requirement information and attribute requirement information, transmits the received question information to an answerer terminal device used by a user identified by the acquired user identification information, receives determined reward information, which indicates a reward determined by a questioner for answer information, from the questioner terminal device which receives the answer information transmitted from the answerer terminal device, and causes a storage means to store the received determined reward information in association with the user identification information of an answerer.

Abstract: A lottery system utilizing an electronic mail comprises means for specifying participants for a lottery from a database, means for uniquely allocating an electronic mail address to each of said specified participants so that said electronic mail addresses are different from each other; means for sending a first electronic mail to each of said participants, in which the electronic mail address is affixed as a unique access key to each of said participants; means for recognizing an application for the lottery from each of said participants by receiving a second electronic mail sent back to said electronic mail address; and means for notifying each one of said participants who sent back the second electronic mail to the electronic mail address of the result of said lottery.