A method and an apparatus for distributing a load of a base station in a wireless communication system supporting multi-carriers are provided. In the method, carriers are classified into a plurality of groups. A load of each of a plurality of cells corresponding to the plurality of groups, is determined. A cell load of each of the plurality of cells is compared with at least one threshold set in advance. When a cell load of a first cell has a value greater than the at least one threshold set in advance, a cell inside a group of the first cell or a cell inside a group different from the first cell is selected depending on the cell load of the first cell. A terminal of the first cell is allowed to perform a handover to the selected cell.