Information recording and reproducing apparatus, and information recording and reproducing method

An information recording and reproducing apparatus (S) is provided with: an information recording device (R) for processing information inputted from an external portion at a predetermined input rate, to thereby generate record information and for recording the generated record information onto a record medium (1) at a record rate higher than the input rate; an information reproducing device (P) for detecting the record information at a predetermined detection rate for reprocessing the detected record information to thereby reproduce the record information, and for outputting the reprocessed record information to the external portion at an output rate lower than the detection rate; and a controller (14) for respectively controlling the information recording device and the information reproducing device such that, in a time duration during which the record information is not recorded and which is caused by a difference between the record rate and the input rate, the record information already recorded on the record medium until a present time is reproduced while the information from the external portion is continued to be inputted, and such that, in a time duration during which the record information is not detected and which is caused by a difference between the detection rate and the output rate, the record information which is not recorded yet is recorded onto the record medium while the reprocessed record information is continued to be outputted to the external portion.