is transferred to the step 311 however if the step 314 judges no a step 316 transmits the response signal to the terminal then a step 317 receives dcn and a step 318 clears the line so that the image data reception operation is terminated fig7 shows a 1 page recording procedure of this fax first a step 401 judges whether or not the buffer mode flag is set if the step 401 judges yes a step 402 stores the reception data in the fifo buffer ffb and a step 403 inputs the data for 1 line to a top end of the data recording area of the fifo buffer ffb if the buffer mode is not set so that the step 401 judges no a step 404 inputs the reception data for 1 line of this fax to the top end of the data recording area of the fifo buffer ffb in this way after reception data for 1 line is inputted a step 405 judges whether or not the rtc represents the end of the page if the step 405 judges yes a step 406 sets the status signal representing the ending of the 1 page image recording if the step 405 judges no a step 407 judges whether or not the fill bit is added to the image data if the step 407 judges yes a step 408 omits the fill bit in order to form an encoded data having 1 line next a step 409 decodes the image data into the image signal via the encoder decoder 7 and a step 410 judges whether or not the line is the blank line if the step 410 judges.