In this paper, we describe a Group-aware Service Discovery (GASD) scheme for ubiquitous computing. GASD considers the group context in the service discovery for the sake of improving both the system performance and overall user satisfaction. The main features of GASD are as follows: 1) Group Query Aggregation which collects requesting queries and generate a group query from multiple requests of users to avoid conflicts in the sharable service, 2) Sharable Service Assignment which assigns an appropriate service including the private service and the public service to every user based on the group query for the service sharing. Our experimental result shows that GASD has better system performance and overall user satisfactions than the existing semantic service discovery systems. Also, it has better quality of the request result by the efficient assignment algorithm.