| 摘要 |
A mobile communication system 100 includes: a plurality of relay servers 101 and 102 connected via a global IP network so as to be capable of communicating; a first mobile communication terminal 110 connected with the relay server 101 so as to be capable of communicating; a second mobile communication terminal 120 connected with the relay server 102 so as to be capable of communicating; and a message relay server 103 relaying transmission and reception of a message between the mobile communication terminals 110 and 120. The first mobile communication terminal transmits a message including global address information acquired from the relay server 101, to the second mobile communication terminal. The second mobile communication terminal requests the relay server 102 to establish a communication session between the mobile communication terminals 110 and 120 through the relay servers 101 and 102, based on the received global address information.
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