A method for data relocation, comprising: receiving a relocation request sent by a management node, wherein the relocation request comprises a subscriber key and a relocation type identifier; determining, according to the subscriber key, that session information corresponding to the subscriber key exists, determining a relocation processing policy according to the relocation type identifier, and recording relocation information; and sending a relocation response to the management node; wherein the relocation type identifier is an immediate-to-reserved relocation identifier, the determining a relocation processing policy according to the relocation type identifier and recording relocation information comprising: determining, according to the immediate-to-reserved relocation identifier, to perform immediate-to-reserved relocation processing; and searching for, according to the subscriber key, session information corresponding to the subscriber key, determining the start time of the relocation according to the session information, and recording immediate-to-reserved relocation information, wherein the immediate-to-reserved relocation information comprises the subscriber key, the start time of the relocation, and the start time when the subscriber is not allowed to use the service; and the sending a relocation response to the management node comprising: sending a relocation response to the management node, wherein the relocation response comprises the start time of the relocation, so that at the start time of the relocation, the management node sends a data query request to implement data relocation. receiving a relocation request sent by a management node, wherein the relocation request comprises a subscriber key and a relocation type identifier; determining, according to the subscriber key, that session information corresponding to the subscriber key exists, determining a relocation processing policy according to the relocation type identifier, and recording relocation information; and sending a relocation response to the management node; wherein the relocation type identifier is an immediate-to-reserved relocation identifier, the determining a relocation processing policy according to the relocation type identifier and recording relocation information comprising: determining, according to the immediate-to-reserved relocation identifier, to perform immediate-to-reserved relocation processing; and searching for, according to the subscriber key, session information corresponding to the subscriber key, determining the start time of the relocation according to the session information, and recording immediate-to-reserved relocation information, wherein the immediate-to-reserved relocation information comprises the subscriber key, the start time of the relocation, and the start time when the subscriber is not allowed to use the service; and the sending a relocation response to the management node comprising: sending a relocation response to the management node, wherein the relocation response comprises the start time of the relocation, so that at the start time of the relocation, the management node sends a data query request to implement data relocation. determining, according to the immediate-to-reserved relocation identifier, to perform immediate-to-reserved relocation processing; and searching for, according to the subscriber key, session information corresponding to the subscriber key, determining the start time of the relocation according to the session information, and recording immediate-to-reserved relocation information, wherein the immediate-to-reserved relocation information comprises the subscriber key, the start time of the relocation, and the start time when the subscriber is not allowed to use the service; and the sending a relocation response to the management node comprising: sending a relocation response to the management node, wherein the relocation response comprises the start time of the relocation, so that at the start time of the relocation, the management node sends a data query request to implement data relocation. sending a relocation response to the management node, wherein the relocation response comprises the start time of the relocation, so that at the start time of the relocation, the management node sends a data query request to implement data relocation.