To shorten the verifying time of binary font data.

This method is provided with a pseudo binary font data preparing model capable of generating → binary fount data at random. In the preparing method of the pseudo binary fount data, a state machine is enabled to be used and the probability of the transition of the state machine is enabled to be controlled. Moreover, the method is provided with a means for analyzing the result that the pseudo binary fount data prepared by the pseudo binary font data preparing model is compressed, then the probability of the transition of the state machine enabled to be changed based on the analyzed result. Furthermore, a calculating expression is used as another preparing method in the preparing method of the pseudo font data.