A database-assisted TV white space network can achieve the goal of green cognitive communication by effectively reducing the energy consumption in cognitive communications. The success of such a novel network relies on a proper business model that provides substantial incentives for all parties involved. In this paper, we propose an integrated spectrum and information market for a database-assisted TV white space network, where the geo-location database acts as an online platform providing services to both spectrum market and information market. We model the interactions among the database operator, the spectrum licensee, and unlicensed users as a three-stage sequential decision process. Specifically, Stage I characterizes the negotiation between the database and the licensee, in terms of the commission for the licensee to use the spectrum market platform, Stage II models the pricing decisions of the database and the licensee, and Stage III characterizes the subscription behaviors of unlicensed users. Analyzing such a three-stage model is challenging due to the co-existence of both positive and negative network externalities in the information market. Nevertheless of this, we are able to explicitly characterize the impact of network externalities on the equilibrium behaviors of all parties involved. We analytically show that the licensee can never get a market share larger than half in the integrated market. Our numerical results further show that the proposed integrated market can outperform a pure information market in terms of network profit up to 87%.[3], the information and communication technology (ICT) infrastructures account for 3% of global energy consumption and 2% of global CO 2 emissions. Hence, energy optimization of wireless communications, ranging from equipment manufacturing to core functionalities, becomes increasingly important for protecting our environment, coping with global warming, and facilitating sustainable development.