1. An adaptive handover apparatus for a heterogeneous network environment, comprising: an adaptive model control unit, collecting estimation information of a channel environment when a wireless device starting up, and integrating geographical information of said wireless device to determine a first group and a second group of recursive parameters and a channel theoretic model; a power gain prediction unit, based on said channel theoretic mode and said first group of recursive parameters, performing recursive computation on signal strength decay theoretic value, and based on actual signal strength decay value predicted by said channel estimation, said second group of recursive parameters and said recursive computation of signal strength decay estimated value of previous iteration, performing recursive computation on channel tracking to obtain signal strength decay tracking value; a heterogeneous networks analysis unit, based on said signal strength decay tracking value and current wireless network state information, performing prediction and analysis on heterogeneous network performance and adjusting prediction time of the change on signal strength decay of heterogeneous networks; and a handover decision unit, based on said heterogeneous performance analysis to reach a decision and based on said decision to prepare adaptive switching of heterogeneous networks.