1. A method for random access (RA) in a base station, the method comprising:transmitting a pilot signal for RA of a terminal through each of a plurality of beams;
determining a number of at least one RA preamble received by the base station without collision from among a plurality of preambles for the RA transmitted from a plurality of terminals;
determining a beam width based on the determined number of the at least one RA preamble; and
transmitting the pilot signal through at least one beam of the determined beam width.