A communication terminal, a display image control method using the communication terminal, a program and a medium are provided in order to display an opposite party's picture on a display part while executing a videophone communication even if it cannot keep sufficient communication quality.The communication terminal includes a videophone function, a voice communication function and the display part which displays a motion picture or a still picture. The communication terminal displays a picture acquired from an opposite party's communication terminal on a display part as a motion picture while executing the videophone communication. Further, it displays a picture acquired from the opposite party's communication terminal on the display part as a still picture after the videophone communication is switched to the voice communication when the videophone communication could not keep sufficient communication quality.