This paper proposes the distance-video-guarding system technology based on collaboration CBM personal computer which enables additional functions such as monitoring each room while the guarding is in progress. This system sends the atmosphere of guarding by checking the status of environment with the sensor using ISDN. Current remote guarding desktop system uses leased lines (T1/E1 ) applying fast speed rate and security. This system provides an external monitoring system which runs on ISDN Public line also. Monitoring system transfers the natural status of each site to center controller of the guarding system.