The valuation of a wide range of option contracts using the different financial models has acquired increasing popularity in modern financial theory and practice. This paper is dedicated to the plain vanilla option pricing problem, driven according to the one-dimensional Black-Scholes equation, and the main attention is paid to the treatment of boundary conditions. The whole system is discretized by the discontinuous Galerkin method combined with the implicit Euler scheme for the temporal discretization. Three concepts of boundary conditions are mentioned here such as Dirichlet, Neumann and transparent boundary condition. Moreover, their influence on the approximate solution together with the localization of an underlying asset and a strike price is studied. The preliminary numerical results are presented on real data of options on German DAX index obtained for 15SEPT2011 with implied volatilities and compared for the different treatments of boundary conditions to each other.