Apparatus and method for allocating resource in multi-carrier system

An apparatus for allocating a resource of a Base Station (BS) in a multi-carrier system, the apparatus comprising:

• a priority determination unit for determining priority of all Mobile Stations (MSs) that participate in scheduling for each resource block;
• and
• a resource allocation unit for sorting all MSs that participate in scheduling for each resource block in a descending order according to priority, for selecting an MS including top priority as a best MS among MSs each of which includes top priority for each resource block, for allocating a corresponding resource block to the selected best MS, and for additionally allocating a corresponding resource block to the best MS if the best MS exists within a window preset in an adjacent resource block located in directions of at least one of decreasing and increasing a resource block index with respect to the allocated resource block,
• wherein the window includes a specific number of MSs including top priority, where the specific number is based on the window size.