Mobile communication apparatus

The present invention provides a mobile communications apparatus, which optimizes handover timing and avoids communications interruptions with a base station. A handover timing calculating function 23 , which computes a handover timing, is provided in either a mobile station 10 or base station A ( 20 -A) or B ( 20 -B). The handover timing calculating function 23 sets handover timing from a handover point "G", which has reception power as a reference, to a point in time "H", which moves up the required boot-up time for an application that the mobile station 10 is at least currently using.