Systems and methods for visualizing traffic coming in from outside to a network to be managed and being sent out of the network. An information presentation apparatus acquires traffic information regarding a traffic specified in accordance with a user's instruction, where the traffic information has been collected from one or more routers located at a border of the network to be managed. The apparatus also acquires path information regarding a path from a start router, through which the traffic passes into the network, to an end router, through which the traffic passes out of the network, referring to stored internal path information. The apparatus then informs a user of the acquired traffic information in association with the acquired path information. At least one of specification of the traffic and determination of the end router is performed referring to stored external path information.