A method performed by a first Machine to Machine, M2M, node for deleting and registering /re-registering a second Machine to Machine, M2M, node, comprising: a receiving step: receiving a node deletion request for the second M2M node; and a responding step: in response to the node deletion request, deleting a node resource of the second M2M node, and storing control or monitoring data on a physical resource corresponding to the M2M node to be deleted, the physical resource comprising at least one of an Application Entity, AE, resource and a Common Service Entity, CSE, resource; further comprising: receiving a registration request for a third M2M node, the registration request comprising a node identifier, the registration request further comprising a physical identifier, and the physical identifier comprising at least one of an Application Entity, AE, identifier and a Common Service Entity, CSE, identifier; allocating a node resource for the third M2M node according to the node identifier; querying, according to the physical identifier, whether historical control or monitoring data associated with the physical identifier is stored; and if historical control or monitoring data associated with the physical identifier is stored, storing the data in a first physical resource corresponding to the physical identifier; or querying, according to the physical identifier, whether a physical resource associated with the physical identifier is stored; and if the physical resource associated with the physical identifier is stored, storing an address of the node resource as an attribute of the physical resource. a receiving step: receiving a node deletion request for the second M2M node; and a responding step: in response to the node deletion request, deleting a node resource of the second M2M node, and storing control or monitoring data on a physical resource corresponding to the M2M node to be deleted, the physical resource comprising at least one of an Application Entity, AE, resource and a Common Service Entity, CSE, resource; further comprising: receiving a registration request for a third M2M node, the registration request comprising a node identifier, the registration request further comprising a physical identifier, and the physical identifier comprising at least one of an Application Entity, AE, identifier and a Common Service Entity, CSE, identifier; allocating a node resource for the third M2M node according to the node identifier; querying, according to the physical identifier, whether historical control or monitoring data associated with the physical identifier is stored; and if historical control or monitoring data associated with the physical identifier is stored, storing the data in a first physical resource corresponding to the physical identifier; or querying, according to the physical identifier, whether a physical resource associated with the physical identifier is stored; and if the physical resource associated with the physical identifier is stored, storing an address of the node resource as an attribute of the physical resource. receiving a registration request for a third M2M node, the registration request comprising a node identifier, the registration request further comprising a physical identifier, and the physical identifier comprising at least one of an Application Entity, AE, identifier and a Common Service Entity, CSE, identifier; allocating a node resource for the third M2M node according to the node identifier; querying, according to the physical identifier, whether historical control or monitoring data associated with the physical identifier is stored; and if historical control or monitoring data associated with the physical identifier is stored, storing the data in a first physical resource corresponding to the physical identifier; or querying, according to the physical identifier, whether a physical resource associated with the physical identifier is stored; and if the physical resource associated with the physical identifier is stored, storing an address of the node resource as an attribute of the physical resource.