Disclosed herein is a method of visually or auditorily indicating spam status or a spam class for a calling number through a called terminal. The method includes the steps of the destination switching system requesting service from a spam call blocking server by delivering the calling number and a called number to the spam call blocking server; the spam call blocking server inquiring about spam status or a spam class for the calling number; if the spam status is `blocked`, or if the spam status is `blocked` and the spam class is equal to or higher than a predetermined class, the spam call blocking server transmitting the spam status or spam class; the service control system activating caller identification service of a called party; the service control system including information about the spam status or spam class in caller identification information for the caller identification service; the service control system transmitting call connection information and the caller identification information to a destination switching system and, thus, the destination switching system making a call with a called terminal; and the destination switching system delivering the caller identification information to the destination terminal and, thus, providing visual or auditory display through the called terminal.