Abstract: A pager comprises a receiving section for receiving message data, an LCD for displaying the message based on the message data, and a memory for storing the format No. contained in the format code specifying the display format of the message and the actually displayed display format in such a manner that they correspond to each other. When a format code is sensed from the received message data, a display format is read from the memory according to the format No. contained in the format code and develops the subsequence display data on the display format, thereby displaying it on the LCD.

Abstract: A data processor such as a household information system which is realized by an image display with which the initial image of the system changes every time the system is started, and the displayed object moves interactively, employing a small memory. When the power source of the processor is turned on, the initial image display processing unit is started. In the initial image display processing unit, the screen display update processing unit changes the image on the display unit every after a predetermined period of time based upon the state of the images that have been stored in advance in the state storage unit. Moreover, any input from the input unit is detected by the input detect unit. Then, the image state select processing unit selects the state of a new image that corresponds to the input and stores it in the state storage unit.

Abstract: A data processing device includes an emulation processing section for performing prescribed processing on an output signal of an operation pad for conversion into a signal or data which is equivalent to a signal or data that would be obtained when operating a mouse to generate information. The operation pad is then usable with an application program that is designed for use only with signals output from the mouse.