1. A method for achieving privilege separation for a virtual room, comprising: receiving an operation-applying instruction sent by a first-type client; according to the operation-applying instruction, determining whether an operation corresponding to the operation-applying instruction is able to be executed, wherein the first-type client has administrative privileges of the virtual room including a privilege for executing the operation; when the operation corresponding to the operation-applying instruction is able to be executed, sending an operation-executing instruction to a second-type client, such that the second-type client obtains the privilege for executing the operation, according to the operation-executing instruction, wherein the second-type client is selected to receive from the first-type client the privilege for executing the operation without receiving all the administrative privileges; sending a notifying instruction to a third-type client without any of the administrative privileges, such that the third-type client obtains a notification that the second-type client has obtained the privilege for executing the operation; receiving a room-entering request sent by a client; according to the room-entering request, determining a client type corresponding to the client; and sending a client-type notification to all of clients in a room, such that the all of the clients in the room obtain the client type of the client that sends the room-entering request, wherein the client type includes the first-type client, the second-type client, or the third-type client.