In this paper, we survey recent developments in the dynamical systems of rational maps in the field Q_p of p-adic numbers, the field C_p of p-adic complex numbers and the Berkovich space over C_p. For a rational map ϕ ∈ Q_p (z), we mainly investigate the minimality and the chaoticity of the dynamical system ( P~1 ( Q_p ), ϕ) on the projective line ( P~1 ( Q_p ), ϕ) over Q_p. For a complex rational map ϕ ∈ C_p, the dynamical systems ( P~1 ( C_p ), ϕ) and ( P~1 Ber ( C_p ), ϕ) are stuided, where P~1 ( C_p ) is the projective line over C_p...