In the conventional clock, it is difficult to instantly grasp the additional information upon looking at the time and the information is not efficiently utilized. The clock is not popular among people of all ages.In order to solve the above deficiencies, we provide a clock which comprises a clock face for indicating time, having a nearly full-screen display function and an outline appearing to be a face, a storage for facial expression information, storing a plurality of facial expression information displayable on the display, an acquisition unit for external information, acquiring external information, a storage for correspondence information, storing correspondence information for correlating the external information with the facial expression information, and a clock face controller, acquiring the facial expression information to be displayed on the display from the storage for facial expression information by utilizing the external information and the correspondence information, and displaying the information on the display.