A projection apparatus and a projection method are provided. The projection apparatus includes a projection device, a capturing image device, and a processing device. The capturing image device is configured to obtain an environmental image. The processing device is coupled to the projection device and the capturing image device. The processing device is configured to analyze the environmental image to provide at least one effective projection region. The processing device selects one of the at least one effective projection regions as a target projection region. The projection device is configured to project a projection image to the target projection region.