A method for processing gateway recovery, comprising: when a terminal moves from a coverage area of a first mobility management unit to a coverage area of a second mobility management unit, receiving, by the second mobility management unit, flag information from the first mobility management unit, characterized in that the flag information is configured by the first mobility management unit and used to indicate that Packet Data Network, PDN, connection signaling is in a suspended state; and sending, by the second mobility management unit, the flag information to a Serving Gateway, SGW, so as to trigger the SGW to send a bearer update request message to a PDN Gateway, PGW; wherein the bearer update request message carries the flag information; characterised in that the method further comprises: before the operation that the second mobility management unit receives the flag information from the first mobility management unit, receiving, by the second mobility management unit, a Globally Unique Temporary UE Identity, GUTI, from the terminal; and searching for the first mobility management unit according to the GUTI; and when the second mobility management unit receives the GUTI from the terminal, receiving, by the second mobility management unit, an indication message from the terminal, wherein the indication message is to indicate whether the terminal is capable of supporting an Idle state Signaling Reduction, ISR. when a terminal moves from a coverage area of a first mobility management unit to a coverage area of a second mobility management unit, receiving, by the second mobility management unit, flag information from the first mobility management unit, characterized in that the flag information is configured by the first mobility management unit and used to indicate that Packet Data Network, PDN, connection signaling is in a suspended state; and sending, by the second mobility management unit, the flag information to a Serving Gateway, SGW, so as to trigger the SGW to send a bearer update request message to a PDN Gateway, PGW; wherein the bearer update request message carries the flag information; characterised in that the method further comprises: before the operation that the second mobility management unit receives the flag information from the first mobility management unit, receiving, by the second mobility management unit, a Globally Unique Temporary UE Identity, GUTI, from the terminal; and searching for the first mobility management unit according to the GUTI; and when the second mobility management unit receives the GUTI from the terminal, receiving, by the second mobility management unit, an indication message from the terminal, wherein the indication message is to indicate whether the terminal is capable of supporting an Idle state Signaling Reduction, ISR. before the operation that the second mobility management unit receives the flag information from the first mobility management unit, receiving, by the second mobility management unit, a Globally Unique Temporary UE Identity, GUTI, from the terminal; and searching for the first mobility management unit according to the GUTI; and when the second mobility management unit receives the GUTI from the terminal, receiving, by the second mobility management unit, an indication message from the terminal, wherein the indication message is to indicate whether the terminal is capable of supporting an Idle state Signaling Reduction, ISR.