main functions: 1) Visualization. Graphs give data in a two-dimensional picture. ;2) Similarity evaluation. compute the similarity between given two vectors with the metric of edit distance. ;3) Record refomulation.(ID,time,app_records)=> (ID,time,<app,counts>) which is a statistic number involving an estimation of previous records. ;4) Statistic compressing.to mining latent users using previous products,we give a measure providing record compressing in different time dimension.