A data collection device for photovoltaic power generation is provided. The data collection device according to an embodiment includes a receiver that receives data on an amount of photovoltaic power generation, a storage unit that stores a representative pattern of a graph for monitoring the amount of photovoltaic power generation, a control unit that extracts a graph for a first piece of data on the amount of photovoltaic power generation received by the receiver and compares the extracted graph with the representative pattern stored in the storage unit to extract a pattern comparison value, and a transmitter that transmits the first piece of data compared by the system control unit to an external device.