A sensing section reads the dot codes by optically scanning a recording medium on which multimedia information has been recorded in the form of optically readable dot codes. The thus obtained dot codes are processed and restored to the original multimedia information by a scanning conversion section, a data string adjusting section, an error correction section, a reproducing section and a controller. An output unit reproduces each piece of information and outputs them. In this case, on the basis of the dot codes thus read, the scanning conversion section and controller sense information reproduction parameters, such as the dot size. The sensed parameters are then stored in a parameter memory. According to the parameters stored in the parameter memory, the dot codes are then subjected to a reproducing process.