An integrated circuit power consumption calculating apparatus obtains power consumption of an integrated circuit by outputting circuit component transistor connection information of each of circuit components after setting a group of transistors connected via a source terminal/drain terminal of a transistor within each cell of an integrated circuit, by outputting circuit component logic model information after extracting a logic for each of the circuit components from the circuit component transistor connection information information, by obtaining power information (circuit component power information) of each signal transition state of an input/output terminal for each of the circuit components based on the circuit component transistor connection information information, by generating signal terminal transition information with a logic simulation performed for each of the circuit components of the integrated circuit, and by obtaining power consumption in a signal transition of an input/output terminal of each of the circuit components.