An apparatus, method and system for acquiring IPV6 address is described. The apparatus includes a request module (101) and an allocation module (102), the request module (101) is adapted to send an IPV6 address allocation request to the allocation module (102), and acquire an allocated IPV6 address from an IPV6 address allocation acknowledgement returned from the allocation module (102); the allocation module (102) is adapted to allocate an IPV6 address according to the IPV6 address allocation request, make the allocated IPV6 address to be carried in the IPV6 address allocation acknowledgement, and return the IPV6 address allocation acknowledgement to the request module (101). The system includes a user terminal and an IPV6 address management device. The apparatus, method and system improve the security of IPV6 address in use while ensure the uniqueness of IPV6 address.