EHMACC and EHPC programs written in VAX version to calculate the tight-binding extended Huckel method is converted into the micro-soft fortran available to PC. The band calculation of LaNiO3 unit cell and extended ($2{ imes}2{ imes}1$) cell with perovskite structure is made by the PC/386 and PC/486. The calculation is also made for the DOS and the COOP. It is supposed that the electronic property of $LaNiO_3$ is semiconductor along to the ${Gamma}{ ightarrow}H,;H{ ightarrow}N,;and;N{ ightarrow}{Gamma}(2D)$ direction with band gap about 0u.35 eV, while metal property in ${Gamma}{ ightarrow}P;and;P{ ightarrow}N(3D)$ direction. The oxygen atom property in $LaNiO_3$ is more effectively affected by oxygen atom position than defect of nickel atom.