First deficiency information according to a deficiency period of time-series data in a first recording unit among plural recording units and second deficiency information according to a deficiency period of time-series data in a second recording unit are obtained. Then, it is controlled to combine electronic data of a non-deficient period in the first recording unit and electronic data of a non-deficient period in the second recording unit with each other and record the combined electronic data, based on the obtained first deficiency information and the obtained second deficiency information.