A computer-implemented method performed at a virtual reality, i.e., VR, device, comprising: A) collecting biometric information of a user using one or more biometric sensors, wherein the biometric information is collected for registering the biometric information to a user account of the user for use of the VR device; B) before sending a biometric registration request to a service server that provides a service, performing security authentication, wherein performing the security authentication includes the VR device prompting the user to input user account log-in information including a password or other security information to verify identity of the user for logging in the user account C) sending the biometric registration request to the service server, wherein the biometric registration request includes the collected biometric information associated with the user account and the user account log-in information, wherein after the biometric registration, the VR device is configured to initiate biometric authentication based on the user's biometric information after the user initiates the service using a voice command; D) saving the collected biometric information of the user during the biometric registration when the biometric information is registered to the user account on the VR device; E) recognizing a voice command of the user of the VR device, wherein the user is logged in the user account, and wherein the voice command is for initiating a service supported by a VR application for rendering a VR scenario through the VR device; F) using a biometric sensor to collect one or more biometric characteristics of the VR device's user; G) locally at the VR device performing user identity authentication based on the collected one or more biometric characteristics by comparing the collected one or more biometric characteristics with the biometric information saved during the biometric registration; and H) if the user identity authentication is successful, communicating with the service server that provides the service for performing the service, wherein communicating with the service server further comprises i) constructing a voice command recognition request based on the voice command, ii) sending the voice command recognition request through an access interface to the service server, iii) receiving from the service server a character string instruction associated with the voice command, and iv) performing the service in response to the received character string instruction by communicating with the service server. A) collecting biometric information of a user using one or more biometric sensors, wherein the biometric information is collected for registering the biometric information to a user account of the user for use of the VR device; B) before sending a biometric registration request to a service server that provides a service, performing security authentication, wherein performing the security authentication includes the VR device prompting the user to input user account log-in information including a password or other security information to verify identity of the user for logging in the user account C) sending the biometric registration request to the service server, wherein the biometric registration request includes the collected biometric information associated with the user account and the user account log-in information, wherein after the biometric registration, the VR device is configured to initiate biometric authentication based on the user's biometric information after the user initiates the service using a voice command; D) saving the collected biometric information of the user during the biometric registration when the biometric information is registered to the user account on the VR device; E) recognizing a voice command of the user of the VR device, wherein the user is logged in the user account, and wherein the voice command is for initiating a service supported by a VR application for rendering a VR scenario through the VR device; F) using a biometric sensor to collect one or more biometric characteristics of the VR device's user; G) locally at the VR device performing user identity authentication based on the collected one or more biometric characteristics by comparing the collected one or more biometric characteristics with the biometric information saved during the biometric registration; and H) if the user identity authentication is successful, communicating with the service server that provides the service for performing the service, wherein communicating with the service server further comprises i) constructing a voice command recognition request based on the voice command, ii) sending the voice command recognition request through an access interface to the service server, iii) receiving from the service server a character string instruction associated with the voice command, and iv) performing the service in response to the received character string instruction by communicating with the service server. i) constructing a voice command recognition request based on the voice command, ii) sending the voice command recognition request through an access interface to the service server, iii) receiving from the service server a character string instruction associated with the voice command, and iv) performing the service in response to the received character string instruction by communicating with the service server.