as being a broad teaching disclosure directed to persons of skill in the appropriate arts and not as limiting upon the present invention 0033 fig1 is a block diagram showing a configuration of an information processing apparatus according to one embodiment of the present invention as shown in fig1 this apparatus comprises a digitizer portion 1 for accepting a coordinate input by the touch and outputting the input information including the input coordinate and the information as to whether or not there is any touch contact is on or off and a personal computer main body 2 for performing the processing in accordance with the input information the digitizer portion 1 comprises a touch panel 3 for outputting an analog signal voltage value x and y corresponding to x coordinate and y coordinate of a point touched by a finger or a pen an ad converter 4 for converting this analog signal into a digital signal and an interface circuit 5 for converting the input information into a signal conforming to the serial interface standards such as rs232 or usb that can be directly treated by the personal computer main body 2 in accordance with an output of the ad converter 4 the personal computer main body 2 comprises an interface circuit 6 composed of a usb controller and an i o controller and a bus 8 for connecting the interface circuit 6 and the.