We review the progress of our research on Web Graphs. A Web Graph is a directed graph whose nodes are Web pages and whose edges are hyperlinks between pages. Many people use bookmarks and pages of links as a knowledge on internet. We developed a visualization system of Web Graphs. It is a system for construction and analysis of Web graphs. For constructing and analysis of large graphs, the SVD (Singular Value Decomposition) of the adjacency matrix of the graph is used. The experimental application of the system yield some discovery that are unforseen by other approach. The scree plots of the singular values of the adjacency matrix is introduced and confirmed that can be used as a measure to evaluate the Web space.