In dynamic contexts, ontologies and their lexical component (termino-ontologies or TOR) have to frequently adapt to domain evolutions, new uses and new user needs. Among all depending data, ontologybased semantic annotations also are regularly updated to annotate new documents or to reflect new points of view. Within the TextViz ontology-based annotation framework, we propose the EvOnto tool and method that supports a coherent joint change management of termino-ontologies and semantic annotations as well as quality criteria to evaluate automatic text annotations and to detect lacks in the ontology.