1. A method, comprising: in response to a human or machine identification request sent by a client, sending information pertaining to a first operation configured to identify human or machine to the client to be displayed; receiving a second operation that is submitted by the client, the second operation being triggered in response to an interactive operation performed on an operation track associated with the first operation; and identifying a triggering entity for the second operation as either a human or a machine based on a behavior characteristic model, wherein the behavior characteristic model includes a classifier for human operations and machine operations, and the classifier is trained based on operation samples, and wherein the identifying of the triggering entity for the second operation as either a human or a machine based on the behavior characteristic model includes: extracting to-be-identified behavioral characteristic data of the second operation; and in response to a determination that the to-be-identified behavioral characteristic data conforms to a human operation, determining that the triggering entity of the second operation is a human; or in response to a determination that the to-be-identified behavioral characteristic data conforms to a machine operation, determining that the triggering entity of the second operation is a machine; and in response to the determination that the to-be-identified behavioral characteristic data of the second operation conforms to the human operation, responding to an access request sent by the human, or in response to the determination that the to-be-identified behavioral characteristic data conforms to a machine operation, rejecting an access request sent by the machine.