A sensor management unit includes an obtaining unit that obtains sensing data from a sensing device to generate sensing data of a plurality of sensing items, a detection unit that detects an overloaded state of the sensing device, a retrieval unit that determines, based on a detection result obtained by the detection unit, at least one sensing item to be retrieved from of the plurality of sensing items and retrieves the determined sensing item, and an output unit that outputs the retrieved sensing item to an external device.