Patent ID: 8537988

Claim:
A message relay server comprising: a call state control section configured to acquire a call state data which contains identification data of a plurality of telephones which perform a speech communication; a call state storage section configured to store said call state data for every said speech communication; a message storage section; and a message relay section configured to receive a message from a first client terminal of a plurality of client terminals which is in cooperation with a first telephone of said plurality of telephones, specify a second telephone which performs the speech communication with said first telephone based on said call state data and the identification data of said first telephone in said message, receive a message inquiry from a second client terminal of said plurality of client terminals which is in cooperation with said second telephone, transmits said message to said second client terminal based on the identification data of said second telephone in said message, and store said message and the identification data of said first and second telephones as a message storage table in said message storage section.