1. A method for managing a spam number in a mobile communication terminal, the method comprising: determining a spam index for each of at least one phone number using a reception record according to each phone number; and determining spam number registration or non-registration of each phone number according to the spam index, by comparing a spam index of each phone number with a preset non-registration threshold value, and upon determining that a spam index is less than the preset non-registration threshold value, cancelling spam number registration for a phone number corresponding to the spam index less than the preset non-registration threshold value.