A resource reservation system and method in a multihoming environment are disclosed. The method includes: transmitting query messages from the mobile node to multiple adjacent access routers using a plurality of care of addresses (CoAs) stored in the mobile node; transmitting the query messages from the adjacent access routers to a crossover node; at one or more intermediate nodes on a communication path between the adjacent access routers and the crossover node, recording available resource information in the query messages; receiving the query messages at a predetermined correspondent node; analyzing, at the correspondent node, the recorded available resource information in the received query messages and selecting a communication path which transferred a query message containing available resource information indicating the available resources required by the mobile node; and transmitting a resource reservation message from the correspondent node to the mobile node through the selected communication path.