To provide an electronic endoscope processor and an electronic endoscope system, available in compact size and at a low price, that can simultaneously output the main and subordinate relational images as digital signals formed by respective endoscopes in synchronization with their external conditions.

The electronic endoscope processor is provided with an imaging treatment means to generate a first digital image signal by giving imaging treatment to image signals transmitted from electrically and optically connected electronic endoscopes, a signal conversion means to convert an analogue video signal outputted from at least one external device into a second digital image signal, and an output synchronization control means to synchronize the output of the first digital image signal from the imaging treatment means to outside with the output of the second digital image signal from the signal conversion means to outside.

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