To provide a controlling method for an upshift operation for an improved automatic mechanical transmission device for vehicle and a control system therefor.

In this controlling method for an upshift operation for an automatic mechanical transmission device for vehicle and control system therefor, when an upshift from the present connection ratio (GR) is requested (ES>ESU/S), a skip upshift (GRTARGET=GR+N,N>1) and a single stage upshift (GRTARGET= GR+1) are successively evaluated. When a throttle request is higher than a reference value (THL>REF), the skip upshift is evaluated for determining whether the skip upshift can be completed or not by engine speed (ESMIN= ESDEFAULT + offset value) which is higher than other requests so as to promote the selection of an execution priority gear ratio.