An information processing device comprising: a calculator configured to calculate communication quality information by using at least process data which have been transmitted from a field device installed in a plant, the communication quality information representing a communication quality between the field device and the information processing device; a statistic processor (333, 334, 335, 336) configured to obtain statistic information by statistically processing the communication quality information calculated by the calculator over a predetermined period; an output device configured to output the statistic information obtained by the statistic processor (333, 334, 335, 336); a large scale nonvolatile memory; and a large scale volatile memory which has a longer life about a number of writing times than the large scale nonvolatile memory, wherein the communication quality information comprises a loss number of process data, a reception interval, and a delay between transmission and reception, wherein the calculator is configured to calculate the loss number of process data by subtracting a sequence number of first process data received from the field device from a sequence number of second process data received from the field device, the first process data being the last process data received from the field device before the second process data, wherein the statistic processor (333, 334, 335, 336) is configured to generate every minute data by statistically processing latest data for one minute of the communication quality information, to generate every hour data by statistically processing the every minute data for one hour of the communication quality information, and to generate every day data by statistically processing the every hour data for one day of the communication quality information, wherein the large scale nonvolatile memory stores the every minute data, the every hour data, and the every day data, wherein the large scale volatile memory temporarily stores the latest data of the communication quality information, the every minute data and the every hour data and wherein the latest data of the communication quality information stored in the large scale volatile memory has a higher updating frequency than the every minute data, the every hour data, and the every day data stored in the large scale nonvolatile memory. a calculator configured to calculate communication quality information by using at least process data which have been transmitted from a field device installed in a plant, the communication quality information representing a communication quality between the field device and the information processing device; a statistic processor (333, 334, 335, 336) configured to obtain statistic information by statistically processing the communication quality information calculated by the calculator over a predetermined period; an output device configured to output the statistic information obtained by the statistic processor (333, 334, 335, 336); a large scale nonvolatile memory; and a large scale volatile memory which has a longer life about a number of writing times than the large scale nonvolatile memory, wherein the communication quality information comprises a loss number of process data, a reception interval, and a delay between transmission and reception, wherein the calculator is configured to calculate the loss number of process data by subtracting a sequence number of first process data received from the field device from a sequence number of second process data received from the field device, the first process data being the last process data received from the field device before the second process data, wherein the statistic processor (333, 334, 335, 336) is configured to generate every minute data by statistically processing latest data for one minute of the communication quality information, to generate every hour data by statistically processing the every minute data for one hour of the communication quality information, and to generate every day data by statistically processing the every hour data for one day of the communication quality information, wherein the large scale nonvolatile memory stores the every minute data, the every hour data, and the every day data, wherein the large scale volatile memory temporarily stores the latest data of the communication quality information, the every minute data and the every hour data and wherein the latest data of the communication quality information stored in the large scale volatile memory has a higher updating frequency than the every minute data, the every hour data, and the every day data stored in the large scale nonvolatile memory.