A data storing method and a data searching method for the stored data for improving memory employment efficiency of RDS reception data while maintaining searching processing speed of PI code, in the data storing method and the data searching method for the stored data, read-address is set to head of PI area, there is judged whether or not the read-address agrees with PI code of storing candidate, when the read-address disagrees with PI code of storing candidate, the read-address is set to next PI storing position. Next, there is judged whether or not check of all PI code is terminated. When the check is not terminated, the processing after judgement of agreement between address PI code and PI code of storing candidate is implemented repeatedly. When there is no agreed PI code in spite of termination of check of all PI code, the storing candidate PI code and AF data are stored at the next of the rearmost of the AF data. When PI codes agree therewith each other, head of AF area of the read PI code is searched, AF data is stored in the free area.