A management device transmits to a target device a first GETNEXT request comprising a first group of Ma-combined IDs. Each combined ID is a combination of a target ID and one of Ma-index values. Each index value has a first value in its highest digit(s) and one of consecutive values in its lowest digit. The management device obtains Ma-partial information and a second group of an Ma-combined IDs corresponding to the Ma-partial information, identifies a greatest combined ID having a greatest index value from the second group, and transmits a second GETNEXT request comprising Mb-combined IDs comprising the identified greatest combined ID. Each combined ID is a combination of the target ID and one of Mb-index values. Each index value has a second value different from the second value in its highest digit(s) and one of consecutive values in its lowest digit.