Embodiments of the present invention relate to the field of communications technologies, and disclose a call termination method, an application processor, and a modem. In this solution, the application processor receives a hang-up instruction and sends a first message to the modem according to the hang-up instruction, where the first message is used to trigger the modem to directly terminate a call. The modem may terminate the call in a timely manner according to the first message. Therefore, a time consumed in call termination is reduced and efficiency is improved.