A method comprising: collecting, by a computing device, biological characteristic information of a user; displaying, by the computing device, the collected biological characteristic information at an initial position on a screen of the computing device; determining, by the computing device, a target position on the screen using the initial position, and displaying the target position on the screen, wherein determining a target position comprises: randomly generating, by the computing device, a candidate target position; judging, by the computing device, whether the candidate target position and the initial position satisfy a predetermined condition, the predetermined condition comprising whether a distance between the candidate target position and the initial position is at least a first predetermined value; and when the predetermined condition is satisfied, using the candidate target position as the target position; prompting, by the computing device, the user to move the user's biological characteristic, the prompted movement being movement of the displayed biological characteristic information from the initial position on the screen to the target position on the screen; determining the display position on the screen of the displayed biological characteristic information after detecting movement of the user's biological characteristic; and judging, by the computing device, whether the user is a living being using a relationship between the determined display position and the target position. collecting, by a computing device, biological characteristic information of a user; displaying, by the computing device, the collected biological characteristic information at an initial position on a screen of the computing device; determining, by the computing device, a target position on the screen using the initial position, and displaying the target position on the screen, wherein determining a target position comprises: randomly generating, by the computing device, a candidate target position; judging, by the computing device, whether the candidate target position and the initial position satisfy a predetermined condition, the predetermined condition comprising whether a distance between the candidate target position and the initial position is at least a first predetermined value; and when the predetermined condition is satisfied, using the candidate target position as the target position; randomly generating, by the computing device, a candidate target position; judging, by the computing device, whether the candidate target position and the initial position satisfy a predetermined condition, the predetermined condition comprising whether a distance between the candidate target position and the initial position is at least a first predetermined value; and when the predetermined condition is satisfied, using the candidate target position as the target position; prompting, by the computing device, the user to move the user's biological characteristic, the prompted movement being movement of the displayed biological characteristic information from the initial position on the screen to the target position on the screen; determining the display position on the screen of the displayed biological characteristic information after detecting movement of the user's biological characteristic; and judging, by the computing device, whether the user is a living being using a relationship between the determined display position and the target position.