Shift hydraulic apparatus for vehicular automatic transmission

In shift hydraulic apparatus and method for a vehicular automatic transmission, the automatic transmission being constituted by a torque converter and a continuously variable transmission, a bypass circuit which is enabled to communicate an upstream side hydraulic circuit of the hydraulic circuit with a downstream side hydraulic circuit thereof is provided, a switching valve is provided which enables a switching between a communication state of the bypass circuit and a non-communication state thereof, and both of the communication state and the non-communication state of the bypass circuit through the switching valve is controlled.