An electronic device comprising: a display including a touch sensor; a fingerprint sensor disposed under at least a partial region of the touch sensor; and a processor, wherein the processor is configured to: control the fingerprint sensor to acquire fingerprint information of an external object; detect, through the touch sensor, a first region on the display in which a first touch input corresponding to the external object is received at a first time while the fingerprint information is being acquired; characterized in to detect, through the touch sensor, a second region on the display in which a second touch input corresponding to the external object is received at a second time later than the first time while the fingerprint information is being acquired; detect a touch region variance between the first region at the first time and the second region at the second time, the touch region variance being a weighted sum of a variance in x-axes from the first region to the second region, a variance in y-axes from the first region to the second region, a variance in origins from the first region to the second region, and a variance in angles from the first region to the second region; and when the touch region variance is equal to or less than a threshold, perform authentication of the external object by using the fingerprint information. a display including a touch sensor; a fingerprint sensor disposed under at least a partial region of the touch sensor; and a processor, wherein the processor is configured to: control the fingerprint sensor to acquire fingerprint information of an external object; detect, through the touch sensor, a first region on the display in which a first touch input corresponding to the external object is received at a first time while the fingerprint information is being acquired; characterized in to detect, through the touch sensor, a second region on the display in which a second touch input corresponding to the external object is received at a second time later than the first time while the fingerprint information is being acquired; detect a touch region variance between the first region at the first time and the second region at the second time, the touch region variance being a weighted sum of a variance in x-axes from the first region to the second region, a variance in y-axes from the first region to the second region, a variance in origins from the first region to the second region, and a variance in angles from the first region to the second region; and when the touch region variance is equal to or less than a threshold, perform authentication of the external object by using the fingerprint information. control the fingerprint sensor to acquire fingerprint information of an external object; detect, through the touch sensor, a first region on the display in which a first touch input corresponding to the external object is received at a first time while the fingerprint information is being acquired; characterized in to detect, through the touch sensor, a second region on the display in which a second touch input corresponding to the external object is received at a second time later than the first time while the fingerprint information is being acquired; detect a touch region variance between the first region at the first time and the second region at the second time, the touch region variance being a weighted sum of a variance in x-axes from the first region to the second region, a variance in y-axes from the first region to the second region, a variance in origins from the first region to the second region, and a variance in angles from the first region to the second region; and when the touch region variance is equal to or less than a threshold, perform authentication of the external object by using the fingerprint information.