Provided is a network mobility management apparatus for providing mobility in a proxy mobile Internet Protocol (IP) network of mobile nodes which configure a mobile network. The network mobility management apparatus includes an address generation unit and a communication unit. The address generation unit transmits a router request message to a mobile access gateway of a proxy mobile IP network to be accessed by the mobile nodes, and receives a router advertisement message containing a home network prefix to generate an address. The communication unit transmits a proxy binding update message containing the home network prefix and an identification code of the mobile node to the mobile access gateway when the router request message is received from the mobile node, and includes the mobile home network prefix, which is contained in a proxy binding response message received from the mobile access gateway and is for the mobile node, in the router advertisement message to transfer the mobile home network prefix to the mobile node.