To accurately reproduce multimedia information even if a pen type reading device for manually reading the multimedia information recorded to be capable of being optically read is not scanned perpendicularly to a sheet but is scanned at an inclination angle with respect thereto, a CCD arranged in the pen type reading device picks up a dot code from the sheet having a portion in which the multimedia information is recorded as a dot code capable of being optically read. A field memory stores the picked dot code as image data. A demodulating circuit demodulates the image data stored in the field memory. A subsequent signal processing circuit performs predetermined processing of the demodulated image data and outputs the resultant data as the original multimedia information. In this case, an inclination sensor arranged at the rear end of the pen type reading device detects an inclined state of the pen type reading device with respect to the sheet. A CPU, a coordinate conversion circuit, and an address/coefficient generation circuit determine a read address of the image data from the field memory in accordance with the inclined state of the pen type reading device with respect to the detected sheet.