A method for keeping a subscriber identity module card in a standby state, comprising: receiving, by a first subscriber identity module card interface module of a terminal device, an enabling request, wherein the enabling request is used for requesting simultaneous standby of a first subscriber identity module card and a second subscriber identity module card in the terminal device, the first subscriber identity module card is implemented on the basis of software, and the second subscriber identity module card is implemented on the basis of hardware; invoking, by the first subscriber identity module card interface module of the terminal device, a third-party invocation interface provided by an operating system of the terminal device and sending the enabling request to the subscriber identity module, SIM, card control module; and performing by the first subscriber identity module card interface module of the terminal device interaction with the subscriber identity module card control module in the terminal device through the subscriber identity module mobile equipment, SIM-ME, function of the third-party invocation interface with a subscriber identity module mobile equipment function, so as to complete a network access process of the first subscriber identity module card on the basis of a data file of the first subscriber identity module card; wherein the third-party invocation interface is radio interface layer, RIL; and keeping, by the terminal device, the first subscriber identity module card and the second subscriber identity module card in a standby state at the same time according to the enabling request by the SIM card control module simultaneously using a first interface and a second interface to invoke the first SIM card interface module and the second SIM card respectively; wherein the data file of the first subscriber identity module card is stored in the terminal device; or the data file of the first subscriber identity module card is stored in an external storage device connected to the terminal device. receiving, by a first subscriber identity module card interface module of a terminal device, an enabling request, wherein the enabling request is used for requesting simultaneous standby of a first subscriber identity module card and a second subscriber identity module card in the terminal device, the first subscriber identity module card is implemented on the basis of software, and the second subscriber identity module card is implemented on the basis of hardware; invoking, by the first subscriber identity module card interface module of the terminal device, a third-party invocation interface provided by an operating system of the terminal device and sending the enabling request to the subscriber identity module, SIM, card control module; and performing by the first subscriber identity module card interface module of the terminal device interaction with the subscriber identity module card control module in the terminal device through the subscriber identity module mobile equipment, SIM-ME, function of the third-party invocation interface with a subscriber identity module mobile equipment function, so as to complete a network access process of the first subscriber identity module card on the basis of a data file of the first subscriber identity module card; wherein the third-party invocation interface is radio interface layer, RIL; and keeping, by the terminal device, the first subscriber identity module card and the second subscriber identity module card in a standby state at the same time according to the enabling request by the SIM card control module simultaneously using a first interface and a second interface to invoke the first SIM card interface module and the second SIM card respectively; wherein the data file of the first subscriber identity module card is stored in the terminal device; or the data file of the first subscriber identity module card is stored in an external storage device connected to the terminal device.