Abstract: A method of promotion is applied in a server computer that has at least one promotional advertisement proposed by an advertiser and a database having data of members, and the method has steps of (a) charging a budget and a maintenance fee from the advertiser, (b) disseminating the promotional advertisement to multiple recipients by the members before the promotional advertisement expires, (c) determining whether the promotional advertisement is successfully accepted by the recipients before the promotional advertisement expires, (d) appropriating a bonus from the budget for the member when the promotional advertisement promoted by the member is successfully accepted by the recipients and (e) refunding the remaining budget to the advertiser after the promotional advertisement expires.