Magnetic properties of ferromagnet-superconductor hybrid films have been investigated below and above the superconducting critical temperature. Below the superconducting critical temperature, the hybrid films show not only large coercive force but also hysteresis shift. These changes depend on the magnetic state in the ferromagnetic layer at the superconducting critical temperature. The magnetic properties of ferromagnet-superconductor hybrid films are interpreted from the viewpoint of the stray field due to the ferromagnetic layer and flux pinning in the superconducting layer. The magnetization process of ferromagnet-superconductor hybrid films is explained in terms of the critical state model for flux pinning in the superconducting layer.