The　technology　of　Human　Machine　Interface　(HMI)　mainly　investigate　about　how　to　use　machines　in　a　more　humanized　way　so　that　the　communication　between　human　and　the　machine　could　become　more　harmonic　and　natural.　Previous　studies　indicate　that　there　is　an　integration　area　in　the　human　brain　for　audiovisual　information　processing.　Although　machines　also　possess　mechanism　for　audiovisual　processing,　there　is　shortage　of　audiovisual　information　integration.　And　to　solve　this　issue,　the　prerequisite　is　to　make　clear　what　kinds　of　cognitive　processing　characteristics　do　humans　have.　In　this　current　Event-Related　Potentials　(ERPs)　study,　we　adopted　a　left-and-right-separated　sensory　modality　method　to　investigate　the　characteristics　of　human　audiovisual　information　processing.　The　results　showed　that　the　main　audiovisual　interactions　were　found　in　frontal-central　scalp　sites　around　80-100ms　during　the　early　stage　and　280-300ms　during　the　later　stage　of　processing.　This　study　provides　foundation　for　understanding　the　information　processing　characteristic　of　human　cognitive　system　and　for　the　future　machine　humanization.　©　2010　IEEE.