When a mobile host moves from base station to another, The old base station may pre-forward data to neighboring Base stations to avoid transmission delay. However, if other mobile hosts move at short interval the old base station may retransmit the same data to the same neighboring base stations. Also the old base station should retransmit data if the new base station has already discarded data even if the new base station is a member of the multicast group. In this paper we propose Information Exchange Scheme (IES) for resolving above problems. In the scheme, each base station exchanges indirectly the data deliver information with other base station in the same multicast group for efficient and reliable multicast and pre-forwards data not retransmitting the same data when a mobile host moves. We also present how IES is efficient by analyzing and simulation.