System and method for transmitting/receiving data in a communication system

A system and a method for transmitting/receiving data in a broadband wireless communication system for normally performing handover are provided to perform handover normally by proving information about all adjacent BSs within a serving cell and transmitting the data to a specific MS in a unicasting method. A serving BS(304) connects an MS(302) existing within a cell in which the serving BS administrates(312). A serving base station administrates a predetermined cell confirms a mobile terminal existing within a predetermined cell(314). A message including information of a neighboring base station administrating adjacent cells and the predetermined cell is transmitted to a first mobile terminal. The first mobile terminal confirms the message necessary to be transmitted in a unicasting method.