Abstract
Colour confinement is one of the central issues in QCD so that there are various interpretations of this feature. In this paper we have adopted the interpretation that coloured particles are not subject to observation just because coloured states are unphysical in the sense of BRST cohomology. It is shown that there are two phases in QCD distinguished by different choices of the gauge parameter. In one phase, called the “confinement phase”, colour confinement is realized and gluons turn out to be massive. In the other phase, called the “deconfinement phase”, colour confinement is not realized, but the gluons remain massless.
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