A communication terminal for communicating with a counterpart communication terminal includes a receiver that receives image data including an eye image of a user operating the counterpart communication terminal from the counterpart communication terminal, the eye image of the user being captured at the counterpart communication terminal while the user is viewing a predetermined position on a counterpart display, and circuitry that specifies a sightline position indicating a sightline position of the user operating the counterpart communication terminal based on the received image data, generates calibration data indicating a relationship between a first area including the specified sightline position of the user and a second area including the predetermined position on the counterpart display, and adjusts the specified sightline position of the user on a display at the communication terminal based on the generated calibration data.