A communication terminal and reception blocking method thereof are disclosed, by which a signal of a sender having poor credibility can be blocked in advance, by which a plurality of recipients are able to rate a credibility of a specific sender to block a signal of the specific sender and by which information for the rating can be shared. The present invention includes the steps of setting a level of a reception blocking for a signal transmitted from a specific sender identification number, receiving credibility rating information for the specific sender identification number, and if a credibility rating of the specific sender identification number based on the credibility rating information belongs to a range of the set level, deciding the reception blocking for the signal transmitted from the specific sender identification number.