Mutual remote support between users is easily facilitated without troublesome complicated user registration. For user terminals between which remote support is performed and each of which sets a call to be an originator of remote support, a user can use an appropriate supporter user terminal to enable the supporter user terminal to access a supportee user terminal to thereby facilitate setting manipulation and check device (or terminal) status with regard to not only the supportee user terminal but also a supportee device that is communicably connected to the supportee user terminal, by merely selecting the supportee device (or terminal) from an address book stored in the corresponding user terminal.