The present invention relates to a collaboration system and method among heterogeneous nomadic/mobile communication networks using a grid service. By using a system in which GSI (Grid Service Infrastructure) is overlaid on heterogeneous nomadic/mobile communication networks, access to resources that are accessible with different interfaces can be made with a single standard interface. Further, a vertical hand-off among heterogeneous networks and access to location information can be easily performed. In addition, mutual operationality among networks can be improved and an efficient collaboration environment can be constructed.