Patent ID: 7502387

Claim:
A message center which intermediates with a message sent from a sending terminal, sends the message to a receiving terminal without waiting for a send request from the receiving terminal, the message center comprising: a message sending/receiving unit for sending and receiving a message; a time control unit controlling a current time; a message generation unit generating a first message including time information indicating a sending time, and making the message sending/receiving unit send the first message to a communication terminal for which a time is to be set; a message analysis unit retrieving time information from a reply message which is sent from a communication terminal receiving the first message, received by the message sending/receiving unit, informs of reception of the first message, and includes time information indicating a sending time of the reply message from the communication terminal; and a time error calculation unit calculating a time error between a message sending time in the message center and a time setting time by the communication terminal for which a time is to be set according to time information which is contained in the first message and indicates the sending time of the first message, and time information retrieved by the message analysis unit and time information which is contained in the reply message and indicates the sending time of the reply message, wherein the message generation unit receives calculation of a time error by the time error calculation unit, generates a second message containing time information indicating a time adjusted by an amount of time error calculated by the time error calculation unit, and makes the message sending/receiving unit send the second message to the communication terminal for which the time is to be set.