Embodiments of the present invention provide an information transmission method and apparatus, including: sending, by a routing apparatus, an IP address of the routing apparatus to an HPCRF entity via a VPCRF entity; receiving via the VPCRF entity, an IP address of the HPCRF entity sent by the HPCRF entity, the IP address of the HPCRF entity is sent after the HPCRF entity receives the IP address of the routing apparatus; and performing communication with the HPCRF entity according to the IP address of the HPCRF entity and the IP address of the routing apparatus. Therefore, information transmitted between the routing apparatus and the HPCRF entity no longer needs to be forwarded by the VPCRF entity, but instead, directly performed between the routing apparatus and the HPCRF entity, thereby reducing signaling overheads and saving network resources.