In some embodiments, a user may be an owner of the user terminal 130. In some embodiments, the owner of the user terminal 130 may be someone other than the user. For example, an owner A of the user terminal 130 may use the user terminal 130 to send a service request for a user B, or receive service and/or information or instructions from the server 110. In some embodiments, a provider may be a user of the provider terminal 140. In some embodiments, the user of the provider terminal 140 may be someone other than the provider. For example, a user C of the provider terminal 140 may user the provider terminal 140 to receive a service request for a user D, and/or information or instructions from the server 110. In some embodiments, “user” and “user terminal 130” may be used interchangeably, and “provider” and “provider terminal” may be used interchangeably.