The disclosed method includes: generating data of a first circuit diagram by disposing a block that represents a connection relationship between first branch lines included in a first bus line in a second circuit diagram and second branch lines included in a second bus line to be connected to the first bus line in the second circuit diagram so as to connect the first bus line with the second bus line through the block, wherein the block represents that the connection relationship identified by connection relationship data is depicted in detail in a lower-layer than a layer of the block; and generating display data including the connection relationship data and the first circuit diagram to output the generated display data.