A method of calculating node potentials in a network including current flow nodes on wirings with high precision at high speed is provided. Provided are a drive method of making voltages applied to electron-emitting devices uniform using the calculating method and an apparatus for manufacturing an image display apparatus including the electron-emitting devices. Assume that n nodes are located between one end of a wiring in which a potential DL is set and the other end of the wiring in which a potential DR is set. At a j-th node counted from the one end, when a current value flowing therefrom is Ij, a node potential is Vj, resistance elements between a terminal and a node and between adjacent nodes are R0 to Rn+1, and a resistance between both end of the wiring is Rall, the node potential Vj is calculated by the following expression. V j = D L ⁢ 1 R all ⁢ ∑ q = j n ⁢ R q + D R ⁢ 1 R all ⁢ ∑ p = 0 j - 1 ⁢ R p - ∑ k = 1 n ⁢ ( 1 R all ⁢ ∑ p = 0 min ⁡ ( j , k ) - 1 ⁢ R p ⁢ ∑ q = max ⁡ ( j , k ) n ⁢ R q ) ⁢ I k