A quarantine method and system for allowing a client terminal to connect to a user network. Namely, a drug comprising, as the active ingredient, a proliferative vector which contains a Survivin promoter proliferating depending on the expression of Survivin. A single one of the values is selected for each of the plurality of channels to detect a preamble of a frame in the wireless signal. When the balloon is inflated, retrograde blood flow from the coronary veins is prevented, the pressure in the coronary veins is increased and the coronary veins are enlarged allowing the lead to freely advance through them. Accordingly, the data can be exchanged between a certain client and another client.