Privacy protection method for terminal subscriber, privacy protection terminal device, and privacy protection program

A privacy protection method for a terminal subscriber and a terminal and program for implementing the same are provided, wherein at least either a picture or voice associated with at least either an individual or an organization registered in an address book is preregistered in a terminal equipped with a function that enables the terminal to be switched between a privacy mode and a non-privacy mode, and wherein when a call arrives at the terminal in the privacy mode, processing is performed at least either to display an image or to reproduce voice with which a caller cannot be identified, instead of displaying the picture or reproducing the voice registered in the address book, while when a call arrives at the terminal in the non-privacy mode, processing is performed at least either to display the picture or to reproduce the voice registered in the address book, thereby preventing the pictures, etc. preregistered in the terminal from being unrestrictedly presented for display for viewing by other persons, and thus protecting the privacy of the terminal subscriber.