Several robotic surgical systems have been developed for minimally-invasive surgery including commercialized products such as da Vinci and ZEUS. We have developed a minimally-invasive surgical system, which had performed remote surgery experiments for several times including a transnational remote surgery. The developed system consists of an operation site, a surgery site, and a communication link. The operation site is where the operator exists. The surgery site is where the patient, the slave manipulator and assistants exist. These two sites can be connected by various network lines (e.g. ISDN, LAN and ATM) for sending/receiving information of visual information, auditory information, and control signal for the manipulators. In this paper, the overview of the developed system and its remote surgery experiments are described.