The present invention relates to an apparatus for processing digital signals capable of detecting jamming signals and achieving a technique using a circuit which detects whether an interference signal of a band of the received frequency exists or not. The apparatus operates from a CDMA-2000 base station device using the technique of a Digital Radio. The invention establishes the detection of jamming signals regarding a received frequency band, comprising: adding an additional digital signal processor (a received signal strength detecting part) other than a DSP which deals with a specific FA using a Multi-Carrier signal processing method of a digital wireless technique; and establishing a detecting function for jamming signals by using the additional digital signal processor as a SCAN, regarding frequency band. In addition, a RF receiver is used among the conventional jamming signal detecting apparatuses, which adds an AGC (Automatic Gain Control) to a DSP which deals with the processing a digital medium frequency signals; and jamming signal detecting function is maintained more simple and inexpensively. And since it is a frequency SCANNING method, it is possible to identify where the frequency band is occurred when a jamming signal is detected.