A storage apparatus acquires a data block including event data, time series information, first attribute information, and second attribute information. A first temporary accumulating unit and a second temporary accumulating unit temporarily accumulate the acquired data block in a first temporary storage unit and a second temporary storage unit, respectively. A first storing unit sorts a plurality of data blocks accumulated in the first temporary storage unit by the first attribute information and in a time series order identified from the time series information, and stores the sorted data blocks in a first storage unit. A second storing unit sorts a plurality of data blocks accumulated in the second temporary storage unit by the second attribute information and in a time series order identified from the time series information, and stores the sorted data blocks in a second storage unit.