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This paper proposes a mechanism to aggregate bandwidth of multiple network interfaces on a computer. Recently one single computer entails multiple different wireless network interfaces, such as IEEE 802.11a/b/g/n, Bluetooth, WiMAX, and so on. They can be combined, and we can aquire broad bandwidth. We designed and developed a Socket-level Bandwidth Aggregation Mechanism (SBAM). SBAM can aggregate multiple interfaces on a computer to offer broad bandwidth. In addition, implementation in socket layer causes easy deployment and adaptation to existing environment. We evaluated SBAM under actual wireless network environments. SBAM offers broad bandwidth by utilizing various wireless devices on a computer while it avoids modification to existing environment.