1 34 pattern development for a standard type face is carried out by using the modification data h1 step s104 whereas if the read modification data number is 34 2 34 pattern development for an obliquely modified type face is carried out by using the modification data h2 step s105 at step s106 the developed character pattern is outputted from the modification element 2 to an output device via the output element 3 the output device may be a printing system crt telephone line or the like to which patterns can be transferred through electric coupling magnetic coupling or the combined coupling the control procedure is completed by steps s102 to s106 various modifications of this invention are possible as in the following 1 in the above embodiment font patterns having two types of type faces i e standard and modified type faces are outputted the number of modified type faces may be two or more in this case the modification data for two or more type faces are stored in the modification memory 5 and the type face to be used is externally designated once for a document to be made 2 in the above embodiment there are stored in the directory table 4 1 the pattern address and the modification number which is used to discriminate between a character code with enabled modification and a character code with disabled modification the modification data number may be detected by decoding a character code read from the input element 1 to send the detected number to the modification element 2 as appreciated from the foregoing description of this invention a particular character symbol code which.