A method of providing sales information management service using a single view interface is provided, the step of receiving customer information from the user terminal and customer information, which is the information of the customer who is in charge of the customer, and the sales opportunity data reflecting the customer's requirements from the user terminal. The step of checking the validity of at least one required input item previously established and receiving and storing the input item data, and when the sales opportunity of the sales opportunity data is converted to a contract through the sales activity, the contract management data of the contract is transferred to the user terminal. And mapping and storing the sales opportunity data received from the data, and establishing a database by linking the sales opportunity data and at least one item data included in the contract management data.
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