A wearable electronic device, comprising: a processor; a memory; a communications unit; an input unit; and a data processing unit, wherein the memory is configured to store software programs and modules of a first operating system and a second operating system; the processor is configured to switch the first operating system to the second operating system according to a first operation instruction that is entered by a user and received by the input unit; wherein the communications unit is configured to establish a communication connection to an intelligent terminal in a wireless access mode, after the first operating system is switched to the second operating system, wherein the processor is further configured to determine, according to a service request instruction that is sent by the intelligent terminal and received by the communications unit, to run a first application supported by the second operating system; and the communications unit is further configured to send, to the intelligent terminal, a response message indicating that the first application has already been run, the communications unit is configured to receive, by using the first application supported by the second operating system, first information sent by the intelligent terminal, wherein the first information comprises transaction data for completing online payment; the processor is further configured to determine, according to a second operation instruction that is entered by the user and received by the input unit, that the first information received by the communications unit is correct; the data processing unit is configured to perform, by using the second operating system, encryption or signature processing on the first information that is determined to be correct by the processor, to obtain second information; and a processor; a memory; a communications unit; an input unit; and a data processing unit, wherein the memory is configured to store software programs and modules of a first operating system and a second operating system; the processor is configured to switch the first operating system to the second operating system according to a first operation instruction that is entered by a user and received by the input unit; wherein the communications unit is configured to establish a communication connection to an intelligent terminal in a wireless access mode, after the first operating system is switched to the second operating system, wherein the processor is further configured to determine, according to a service request instruction that is sent by the intelligent terminal and received by the communications unit, to run a first application supported by the second operating system; and the communications unit is further configured to send, to the intelligent terminal, a response message indicating that the first application has already been run, the communications unit is configured to receive, by using the first application supported by the second operating system, first information sent by the intelligent terminal, wherein the first information comprises transaction data for completing online payment; the processor is further configured to determine, according to a second operation instruction that is entered by the user and received by the input unit, that the first information received by the communications unit is correct; the data processing unit is configured to perform, by using the second operating system, encryption or signature processing on the first information that is determined to be correct by the processor, to obtain second information; and