A Web-based CTI system has a first control module displaying, on a screen of a customer terminal, a phone number for specifying an in-charge person terminal utilized by an optimal in-charger person determined based on a browse history and input information given so far in response to an inquiry request occurred in the midst of browsing a page through on the screen of the customer terminal utilized by a customer, and a second control module displaying, when there occurs a receipt of a voice communication connected to a phone number for specifying the in-charge person terminal that is displayed on the screen of the customer terminal, on the screen of the in-charge person terminal a piece of information as an inquiry content containing an interest of the customer utilizing the customer terminal that has been generated based on the browse history and the input information, the screen display being triggered by the receipt of the voice communication.