within cell a 410 cell b 420 and cell c 430 detect a signal when the frequency reuse scheme is implemented in a communication system according to an exemplary embodiment of the present invention with reference to fig5 a to 5c here u201c a region signal u201d represents a signal received through a frequency band allocated to the region fig5 a illustrates a signal detection in a third region fig5 b illustrates a signal detection in a second region and fig5 c illustrates a signal detection in a first region as shown in fig5 a upon detection of a third region signal an ms regards a first region signal which uses the same frequency band as a third region signal as noise and detects the third region signal in this case since power allocated for the third region is higher than power allocated for the first region performance deterioration due to the first region signal is small so that a separate detection procedure for the third region signal is not required as shown in fig5 b upon detection of a second region signal an ms regards a first region signal which uses the same frequency band as a second region signal as noise and detects the second region signal in this case since power allocated for the second region is higher than power.