1. A method for recognizing tumorous living cell tissue, comprising the steps of emitting electromagnetic radiation in a locally defined manner onto cell tissue by a radiation source, deactivating the radiation source and, after deactivating the radiation source, measuring inherent fluorescence intensity of the cell tissue excited by the electromagnetic radiation with time and spectral resolution using known sampling rate(s) for at least one wavelength using a detector, determining difference autocorrelation function C(t) of the inherent fluorescence intensity using the measured inherent fluorescence intensity, calculating fractal dimension D F for the irradiated cell tissue as a proportionality between the determined difference autocorrelation function C(t) and an exponential function with a time as a base and an exponent comprising the fractal dimension D F , and using the calculated fractal dimension D F for a classification with respect to a presence of a tumor in the irradiated cell tissue.