In some possible implementation solutions, an emergency situation such as power-off/WLAN disconnection may occur in the smart television 111. In this case, a device status of the smart television 111 relative to the mobile phone 407 is an offline state, and a playback control command of the mobile phone 407 for the smart television 111 fails To indicate, to the user on the mobile phone 407, that playback control fails, display of the playback control card 409 optionally stops; one or more icons optionally become icons that can be used not to receive a user operation; colors of one or more icons optionally change, for example, colors of the volume icon 421, the playback icon 423, the volume display bar 425, the slider 425A, the playback progress display bar 427, the slider 427A, the rewind icon 429, the fast-forward icon 431, and the next-episode icon 433 in the playback control card 409 shown in