A method provides a call-connected party's information to a terminal in a private
exchange network. The method displays the call-connected party's information in
a private exchange network, and provides accurate information of a call originator
to a terminal of a call receiver. The private exchange system is connected to a
CTI (Computer Telephony Integration) server having a database including a phone
number and various information corresponding to the phone number, and includes
at least one terminal being a slave terminal for receiving/displaying information
of the database. A method for providing a call-connected party's information in
a private network using the private exchange system includes: a) if there is an
information retrieval request for a certain phone number in the private exchange
system, generating an information retrieval request message having the requested
phone number in the private exchange system, and allowing the private exchange
system to transmit the information retrieval request message to the CTI server;
b) upon receiving the information retrieval request message from the private exchange
system, checking whether there is a database matched with the phone number contained
in the information retrieval request message in the CTI server, generating a database
checking result message, and transmitting the database checking result message
to the private exchange system; and c) upon receiving information matched with
the phone number from the CTI server, allowing the private exchange system to transmit
the information to a corresponding terminal.