A resource allocation method and a base station for shortening an operation for updating an average data rate in a per-user scheduling metric calculation in the wireless communication system adopting a Proportional Fairness scheduler are provided. The resource allocation method includes receiving, at a base station, a channel quality indicator from at least one mobile station to be allocated resources, calculating a data rate available for the at least one mobile station based on the channel quality indicator, calculating a scheduling metric by dividing the data rate by an average data rate of the at least one mobile station, determining a resource allocation priority based on the scheduling metric, allocating the resources to the at least one mobile station according to the resource allocation priority, and updating the average data rate of only the at least one mobile station allocated the resources.