In a method for creating an equivalent circuit for a three-terminal capacitor including first, second, third and fourth electrodes, a first capacitor conductor connected between the first and second electrodes, and a second capacitor conductor connected between the third and fourth electrodes, the equivalent circuit includes a first line connecting the first electrode to the second electrode; a second line connecting the third electrode to the fourth electrode; a third line that includes a first capacitor component and that connects the first line to the second line; a first circuit component including a first inductor component and a first resistor component provided between a connection portion between the second line and the third line and the third electrode; and a second circuit component including a second inductor component and a second resistor component provided between the connection portion and the fourth electrode.