IP (internet protocol) address allocation method and device

The invention discloses an IP (internet protocol) address allocation method and an address allocation device, which are used for reducing business surface processing load during IP address allocation for an MUE (multiple user equipment) terminal user. The method comprises the following steps that a GGSN (gateway general packet radio service support node) receives PDP (packet data protocol) creation context request information, wherein the information comprises a user identification corresponding to the current user; the GGSN judges the terminal type of the current user attribution according to the user identification, and the current user attribution terminal is determined; when the current user attribution terminal type is the MUE type, whether an IP address is allocated to the user with the same terminal as the current user or not is judged; when the IP address is allocated to the user with the same terminal as the current user, the GGSN inquires the IP address allocated to the user with the same terminal as the current user and determines that the IP address is the current IP address; and the GGSN allocates the determined IP address of the current user to the current user requesting to access the network.